| A | B |
|---|
| Retention hyperkeratosis | Hereditary tendency for acne-prone skin to retain dead cells in the follicle. |
| Anerobic | Bacteria that cannot survive in the presence of oxygen. |
| Intrinsic factors | Skin aging factors over which we have little control. |
| Extrinsic factors | Environmental factors that contribute to aging and the appearance of aging. |
| UVA Rays | Aging, deep penetrating rays that weakens collagen and elastin fibers, causing wrinkling and sagging of tissues. |
| UVB Rays | Burning rays that cause sunburn and tanning of the skin. |
| SPF | Sun Protection Factor |
| Free radicals | Unstable molecules that cause biochemical aging. |
| Sensitization | An allergic reaction created by repeated exposure to a chemical or a substance. |
| Allergic Contact Dermatitis | Occurs when a person develops an allergy to an ingredient or a chemical created by repeated skin contact. |
| Irritant Contact Dermatitits | Occurs when irritating substances temporarily damage the epidermis. |
