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1. Which is the largest organ of the human body?

The skin is the largest organ by surface area and weight, with three main layers: epidermis, dermis, and subcutaneous.

2. Which layer of the epidermis contains the cells that produce new skin?

The stratum basale (basal layer) is the deepest epidermal layer where new keratinocytes are produced and where melanocytes reside.

3. The stratum lucidum is found on which part of the body?

The stratum lucidum is a clear, thin layer found only in the thick skin of the palms and soles.

4. Which cells produce the pigment that gives skin its color?

Melanocytes are located in the stratum basale and produce melanin, which determines skin color and helps shield deeper cells from UV light.

5. Which epidermal layer is the outermost and consists of dead, keratinized cells?

The stratum corneum is the outermost layer; its dead, flattened keratinocytes are what cosmetic exfoliation targets.

6. Which layer of skin contains most of the collagen, blood vessels, and hair follicles?

The dermis is the middle layer of skin and contains collagen, elastin, blood vessels, nerves, hair follicles, and sebaceous and sweat glands.

7. The subcutaneous layer is primarily composed of which tissue?

The subcutaneous (subcutis) layer is mostly adipose (fat) and connective tissue that cushions and insulates the body.

8. Under California law, a cosmetologist using a chemical exfoliant may legally act on which layer?

Licensee exfoliation is limited to the dead cells of the stratum corneum; removal of living layers is the practice of medicine.

9. Which gland in the dermis produces sebum (oil)?

Sebaceous glands secrete sebum, the oily substance that lubricates skin and hair; sudoriferous glands produce sweat.

10. Which of the three layers of the hair shaft contains pigment and gives hair its strength and elasticity?

The cortex is the middle layer; it holds melanin pigment and most of the protein bonds that determine hair strength and elasticity.

11. Which structure at the base of the hair follicle supplies nutrients via blood vessels?

The dermal papilla is a small mound of connective tissue at the base of the follicle that supplies blood and nutrients to the growing hair.

12. The outermost layer of the hair shaft, composed of overlapping scales, is the:

The cuticle is the outermost layer of the hair; its overlapping scales protect the cortex and must be opened for chemical services.

13. Which phase of the hair growth cycle is the active growth phase?

Anagen is the active growth phase. On the scalp, it lasts 2–7 years and accounts for the majority of hairs at any time.

14. About how long does the catagen (transition) phase typically last?

Catagen is the short transition phase between active growth and resting; it lasts roughly 1–2 weeks.

15. Which phase is the resting/shedding phase of hair?

Telogen is the resting phase that lasts about 3 months; at the end of telogen the hair sheds and the follicle re-enters anagen.

16. A client asks if losing about 70 hairs in a day means she is going bald. The best answer is:

Daily loss of about 50–100 telogen hairs is a normal part of the hair cycle. Sudden, heavy, or patchy loss warrants medical referral.

17. The only living part of the nail unit is the:

The matrix, hidden under the proximal nail fold, is the living tissue that produces the nail plate. Damage to the matrix can cause permanent deformity.

18. The visible white half-moon at the base of the nail is the:

The lunula is the visible portion of the matrix and appears as a whitish half-moon at the proximal end of the nail plate.

19. Which structure forms the seal of skin under the free edge of the nail?

The hyponychium is the skin seal beneath the free edge that helps prevent microorganisms from entering the nail bed.

20. While prepping a client's hand, a manicurist sees the cuticle area is intact but the lateral nail fold is red, swollen, and oozing pus. The correct action is:

Pus and swelling suggest paronychia (an infection). Service must be declined and the client referred; the salon is not a treatment site for infections.

21. Bacteria shaped like clusters that can cause boils and impetigo are:

Staphylococci are cluster-forming cocci. Streptococci grow in chains. Bacilli are rod-shaped; spirilla are spiral.

22. Streptococcus bacteria typically grow in which arrangement?

Streptococci grow in chains and can cause strep throat, impetigo, and other skin infections.

23. Rod-shaped bacteria responsible for diseases like tuberculosis and tetanus are classified as:

Bacilli are rod-shaped bacteria. They include the agents of tuberculosis (Mycobacterium tuberculosis) and tetanus (Clostridium tetani).

24. Spirilla-shaped bacteria are associated with which of the following diseases?

Spiral (spirilla / spirochete) bacteria cause syphilis and Lyme disease. Colds and flu are viral; athlete's foot is fungal.

25. Which statement about microorganisms is most accurate?

Only a minority of bacteria cause disease; most are harmless or beneficial. Viruses are much smaller than bacteria; fungi are a separate kingdom.

26. Hepatitis B and HIV are spread primarily by:

Both hepatitis B and HIV are bloodborne pathogens transmitted through blood and certain body fluids — a key reason implements that may contact blood must be properly disinfected.

27. Human papillomavirus (HPV) most commonly causes which condition that might be seen in a salon?

HPV causes warts, including plantar and common warts. Warts are contagious; service should be modified to avoid the area, and clients referred to a physician.

28. A disinfectant used in a California salon on nonporous, multi-use implements must be EPA-registered and effective against which combination?

California requires hospital-grade, EPA-registered disinfectants that are bactericidal, virucidal, and fungicidal for multi-use implements that contact skin.

29. Ringworm of the scalp (tinea capitis) is caused by:

Despite its name, ringworm is a fungal infection (dermatophyte). It is contagious; service should be declined and the client referred to a physician.

30. Head lice (Pediculus capitis) are classified as:

Head lice are parasitic insects that feed on scalp blood. They are spread by direct contact and through shared combs, brushes, and headwear.

31. A client arrives with visible live lice in her hair. The appropriate response in a California salon is:

Active infestation must not be treated in the salon; service is declined and the client is referred. Tools used must then be disinfected per California rules.

32. Onychomycosis is best described as:

Onychomycosis is a fungal infection of the nail plate/bed, often causing thickening, discoloration, and crumbling. It is contagious; service is declined.

33. Onycholysis refers to:

Onycholysis is the painless separation of the nail plate from the bed. Causes include trauma, allergic reaction, and certain diseases. Enhancements should not be applied over a separated plate.

34. Paronychia is an infection that affects which area?

Paronychia is an infection (often bacterial, sometimes fungal) of the skin and nail folds around the nail. It presents with redness, swelling, and often pus.

35. A client with a clearly thickened, yellow, crumbling toenail asks for a pedicure. What is the correct action?

Signs strongly suggest onychomycosis, a fungal disease. Treating or 'fixing' diseased nails is outside the scope of practice and risks spreading infection.

36. An esthetician sees a client whose face has open, weeping pustules and crusting that look like impetigo. What is the appropriate action?

Open, weeping lesions are signs of possible contagious infection. Estheticians do not diagnose or treat infections; service is declined and the client referred.

37. Acne is best described as a disorder of the:

Acne involves blockage and inflammation of the pilosebaceous unit. Estheticians can extract non-inflamed comedones; medical treatment of severe acne is outside scope.

38. A red, scaly rash with silvery plaques most commonly seen on elbows and knees is consistent with:

Psoriasis is a chronic autoimmune skin disorder characterized by silvery scales. Cosmetologists adapt the service to avoid irritation but do not treat it.

39. Androgenetic alopecia is best known as:

Androgenetic alopecia is pattern hair loss linked to genetics and hormones. Alopecia areata causes round patches; tinea capitis is scalp ringworm.

40. Sudden, well-defined round patches of complete hair loss without scarring most likely indicate:

Alopecia areata is an autoimmune condition causing sudden round patches of hair loss with smooth, non-scarred scalp. It warrants medical referral.

41. Dandruff (pityriasis simplex) is best described as:

Common dandruff involves accelerated shedding of stratum corneum cells from the scalp. It is not contagious and is generally managed with anti-dandruff products.

42. Which cranial nerve controls the muscles of facial expression?

Cranial nerve VII (the facial nerve) controls the muscles of facial expression. Cranial nerve V (trigeminal) is the chief sensory nerve of the face.

43. The chief sensory nerve of the face is:

Cranial nerve V (trigeminal) carries most sensation from the face. It has three main branches: ophthalmic, maxillary, and mandibular.

44. Which muscle wraps around the eye and is responsible for closing the eyelid?

The orbicularis oculi circles each eye and closes the eyelid. The frontalis raises the eyebrows; the masseter chews; the platysma is a broad neck muscle.

45. The muscle most responsible for raising the eyebrows is the:

The frontalis (front portion of the occipitofrontalis) lifts the eyebrows and wrinkles the forehead horizontally.

46. The masseter is the chief muscle responsible for:

The masseter is a powerful muscle of mastication that raises the mandible to bring the teeth together.

47. Which of these is a major bone of the cranium?

The parietal bones form the sides and top of the cranium. The maxilla and mandible are facial/jaw bones; the clavicle is in the shoulder.

48. Which nerve supplies sensation and motion to the thumb side of the forearm and hand?

The radial nerve supplies the back of the arm and the thumb side of the hand. Median and ulnar nerves cover the rest of the hand.

49. The muscles that bend the wrist and fingers toward the palm are called:

Flexor muscles in the forearm bend the wrist and fingers toward the palm. Extensors straighten them away from the palm.

50. During a manicure, hand massage is appropriate as long as the licensee:

Licensee massage is relaxation-oriented and surface level. Treating joints, diagnosing conditions, or providing therapeutic medical massage is outside scope.

51. Which of the following acts is clearly outside the scope of a California cosmetologist's license?

Injecting any substance into the skin is the practice of medicine. Cosmetologists who perform such acts are violating California law.

52. A California esthetician asks whether she can perform a 'medium-depth' chemical peel that visibly reaches the dermis. The correct answer is:

Estheticians may only perform superficial peels that act on the stratum corneum. Peels reaching living layers require medical supervision.

53. Which structure surrounds the lower part of the hair follicle and contains rapidly dividing cells?

The hair bulb is the swollen base of the follicle that surrounds the dermal papilla; it contains the actively dividing matrix cells that build the hair shaft.

54. Which of the following best describes the immune system's role relevant to salons?

Broken skin is a path for pathogens; the immune system fights infection. Salons reduce risk by maintaining intact skin and properly disinfecting tools.

55. Eczema (atopic dermatitis) is generally:

Eczema is chronic, non-contagious, and often itchy. Cosmetologists can adapt to avoid irritation but should not diagnose or treat it.

56. Rosacea typically presents as:

Rosacea is a chronic facial condition with redness, flushing, and sometimes papules or visible blood vessels. Licensees adapt the service and avoid irritants.

57. If a client suffers a small cut during a service and bleeds onto a metal implement, the implement must be:

Implements exposed to blood must be cleaned and then disinfected with an EPA-registered, hospital-grade disinfectant used per label, or discarded if single-use.

58. An ingrown toenail (onychocryptosis) is best handled in a California salon by:

Manicurists may file and smooth nails but may not cut into living tissue. A painful or inflamed ingrown nail warrants medical referral.

59. Which sequence correctly lists the layers of the epidermis from deepest to most superficial?

From deepest to most superficial: stratum basale, spinosum, granulosum, lucidum (palms/soles only), and corneum.

60. Pathogenic microorganisms are those that:

Pathogenic microbes cause disease. Most microorganisms are non-pathogenic; only a minority cause infections that licensees must guard against.

61. Sebaceous glands open into which structure rather than directly onto the skin surface?

Most sebaceous (oil) glands empty their sebum into a hair follicle, lubricating the hair and skin together. Sudoriferous (sweat) glands, in contrast, have their own ducts that open onto the surface.

62. Pacinian corpuscles, located deep in the dermis and subcutaneous layer, are specialized receptors for:

Pacinian corpuscles are large, onion-shaped encapsulated receptors that respond to deep pressure and vibration. Meissner corpuscles handle light touch, free nerve endings handle pain and temperature.

63. Sensations of pain, itch, and temperature in the skin are carried mainly by:

Free (unencapsulated) nerve endings detect pain, itch, and temperature. Encapsulated receptors like Meissner and Pacinian are tuned to mechanical stimuli such as light touch or deep pressure.

64. A client's intake form notes that her skin's pH is around 5.0. This slightly acidic pH primarily helps to:

Healthy skin sits at about pH 4.5 to 5.5, called the acid mantle. This mildly acidic film discourages many pathogenic microbes and helps keep the stratum corneum's barrier and moisture intact.

65. Which pair of changes in the dermis is most characteristic of intrinsic (chronological) skin aging?

With age, fibroblasts produce less collagen each year, while existing elastin fibers fragment and lose recoil. The combined loss is why aged skin appears thinner, looser, and slower to bounce back.

66. Approximately how long does the anagen (active growth) phase of scalp hair typically last in a healthy adult?

Anagen typically lasts about 3 to 7 years for scalp hair. The catagen transition is only 2 to 3 weeks, and telogen (resting/shedding) is about 2 to 3 months.

67. Within the hair root, the small cone of dermal tissue that pushes up into the hair bulb and supplies blood vessels is the:

The dermal papilla is the vascular peg at the very base of the follicle. Matrix cells of the bulb surround it and divide rapidly, fed by the papilla's capillaries.

68. Black and brown hair color is produced mainly by which type of melanin?

Eumelanin gives black and brown shades. Pheomelanin produces red and yellow tones. The blend and total amount of these two pigments determines natural hair color.

69. A client asks why her hair is turning gray. The most accurate explanation is that:

Graying happens when melanocytes in the hair bulb slowly lose function and deposit less melanin into new hairs. New hairs grow in with less pigment until they appear silver or white.

70. The muscle that pulls the corners of the mouth downward, helping create a frowning expression, is the:

Depressor anguli oris pulls the corners of the mouth down. Levator labii superioris lifts the upper lip; mentalis wrinkles the chin; risorius pulls the mouth corners laterally.

71. Together with the masseter, which deep muscle on the side of the head also assists in closing the jaw during chewing?

The temporalis is a fan-shaped muscle on the side of the head that elevates and retracts the mandible. With the masseter and medial pterygoid, it powers chewing.

72. Which branch of the facial nerve (CN VII) is most relevant when an esthetician massages the cheek and area in front of the ear?

The zygomatic and buccal branches of the facial nerve run across the cheek and supply many muscles of facial expression in that area. Sciatic, radial, and phrenic nerves are not branches of CN VII.

73. Sensation from the lower lip, chin, and lower jaw is carried by which division of the trigeminal nerve (CN V)?

Trigeminal nerve has three sensory divisions: V1 (ophthalmic) for forehead, V2 (maxillary) for cheek/upper lip, V3 (mandibular) for lower lip, chin, and jaw. CN VII is motor, not part of these divisions.

74. When performing a facial lymph drainage massage, the parotid nodes and submandibular nodes ultimately drain toward which deeper group of nodes in the neck?

Facial lymph flows through superficial nodes such as parotid and submandibular, then into the deep cervical chain along the neck. Inguinal, axillary, and popliteal nodes drain other body regions.

75. The adult human skull is commonly described as having how many cranial bones and how many facial bones?

The adult skull is typically described as 8 cranial bones (frontal, two parietal, two temporal, occipital, sphenoid, ethmoid) and 14 facial bones, including the maxillae, mandible, zygomatics, and nasal bones.

76. New nail plate is produced in which part of the nail unit?

The matrix is the only living, growth-producing portion of the nail unit. Damage there can permanently alter the nail. The free edge, hyponychium, and eponychium are not where new plate is created.

77. The pinkish surface beneath the nail plate that supplies nutrients and gives the plate its color is the:

The nail bed is the living tissue directly under the nail plate; its rich blood supply gives the plate its pink color. The matrix lies further back beneath the lunula; the eponychium is the proximal skin fold.

78. A client habitually bites her fingernails down to the skin. The proper term for this is:

Onychophagia is chronic nail biting. Leukonychia refers to white spots, koilonychia to spoon-shaped nails, and Beau's lines to transverse depressions on the plate after illness or trauma.

79. A manicurist notices a deep horizontal groove running across a client's nail plate. This finding, often appearing after a serious illness or injury, is called:

Beau's lines are transverse depressions in the plate caused by temporary disruption of matrix growth during illness, high fever, chemotherapy, or trauma. They grow out as the nail grows.

80. Small white spots on the nail plate caused by minor trauma to the matrix during nail formation are called:

Leukonychia is the term for white spots or marks within the plate, usually from minor matrix trauma. They are harmless and grow out with the nail.

81. A client's fingernails appear concave, like small spoons that can hold a drop of water. This shape is called:

Koilonychia is a spoon-shaped nail. It may be associated with iron-deficiency anemia or chronic irritation. The licensee should not treat it but may suggest the client consult a physician.

82. A client shows red, greasy-looking scales along the scalp, eyebrows, and sides of the nose that come and go. This is most consistent with:

Seborrheic dermatitis is a chronic, non-contagious inflammatory condition seen in oil-rich areas, with red skin and greasy yellow-white scales. Ringworm is fungal and contagious; folliculitis affects follicles with pustules; lice are visible parasites.

83. After a shave service, a client returns with multiple small red bumps and pustules centered on hair follicles along the jaw. The most likely condition is:

Folliculitis is inflammation of hair follicles, often bacterial, that appears as small red bumps or pustules at each follicle. Service should be paused and the client referred for medical evaluation if needed.

84. A client develops itchy, blistering hand eczema only after she begins wearing nitrile gloves with a specific accelerator chemical. This delayed reaction, mediated by T-cells, is best classified as:

Allergic contact dermatitis is a T-cell-mediated, delayed (Type IV) reaction to a specific allergen, often appearing 24-72 hours after exposure. Irritant contact dermatitis is not immune-mediated and usually appears quickly with strong irritants.

85. A new licensee plans to use a strong acid peel that, by visible inspection, removes part of the dermis to 'treat' deep wrinkles. Under California's cosmetology scope of practice, this is:

California cosmetology, esthetics, and barbering licenses are limited to the nonliving outer layers of the skin and superficial work. Procedures that intentionally injure or remove the dermis cross into the practice of medicine, regardless of consent or experience.