An esthetician explains to a client why a superficial peel cannot 'remove' a deep wrinkle. Which layer holds the collagen and elastin that determine skin firmness?

Giải thích

Collagen and elastin fibers, blood vessels, nerve endings, and appendages sit in the dermis, with the reticular layer holding the dense structural network. Superficial peels act only on the epidermis, so they improve texture and tone but cannot rebuild dermal structure. The corneum and granulosum are epidermal, and the subcutaneous layer is fat and connective tissue below the dermis.