| A | B |
|---|
| avascular | without blood vessels |
| corium | the dermis, or "true skin" |
| cortex | outer part of an internal organ |
| matrix | the nailbed |
| medulla | inner portion of an organ |
| melanin | pigment that gives color to hair, skin, and eyes |
| melanocytes | cells that make the protein melanin to protect against ultraviolet rays |
| sebum | secretion of sebaceous glands that lubricate the skin |
| urticaria | skin condition characterized by itching wheals or welts and usually caused by an allergic reaction also known as hives |
| alopecia | the loss of hair, baldness |
| cryosurgery | the destruction of tissue by freezing, using liquid nitrogen |
| squamous cell carcinoma | cancer of the epidermis |
