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Chapter 10
nail disorders and diseases
| Term | Definition |
|---|---|
| Beau's Lines | Sometimes called furrows or corrugations; visible depressions running across the width of the natural nail plate; usually a result of major illness or injury that has traumatized the body. |
| blue fingernails | named for the nail bed color; is usually caused by a lack of circulating oxygen in the red blood cells. |
| bruised nail beds | condition in which a blood clot forms under the nail plate, causing a dark purplish spot. These discolorations are usually due to small injuries to the nail bed. |
| discolored nails | Nails turn a variety of colors; may indicate surface staining, a systemic disorder, or poor blood circulation. |
| eggshell nails | Noticeably thin, white nail plates that are more flexible than normal and can curve over the free edge. |
| hangnail | a condition in which the living tissue surrounding the nail plate splits or tears. |
| koilonychia | soft spoon nails with a concave shape that appear scooped out. |
| leukonychia spots | also known as white spots; whitish discolorations of the nails, usually caused by injury to the matrix area; not related to the body's health or vitamin deficiencies. |
| melanonychia | Darkening of the fingernails or toenails; may be seen as a black band within the nail plate, extending from the base to the free edge. |
| nail disorder | condition caused by an injury or disease of the nail unit. |
| nail psoriasis | A noninfectious condition that affects the surface of the natural nail plate causing tiny pits or severe roughness on the surface of the nail plate. |
| nail pterygium | abnormal condition that occurs when the skin is stretched by the nail plate; usually caused by serious injury, such as burns, or and adverse skin reaction to chemical nail enhancement products. |
| onychauxis | Thickening of the nails. |
| onychia | inflammation of the nail matrix followed by shedding of the natural nail. |
| onychocryptosis | also known as ingrown nails; nail grows into the sides of the tissue aroudn the nail. |
| onychogryposis | also known as ram's horn or claw nails; an enlargement of the fingernails or toenails accompanied by increased thickening and curvature. |
| onycholysis | Lifting of the nail plate from the nail bed without shedding, usually beginning at the free edge and continuing toward the lunula area. |
| onychomadesis | The separation and falling off of a nail plate from the nail bed; affects fingernails and toenails. |
| onychomycosis | fungal infection of the natural nail plate. |
| onychophagy | also known as bitten nails; result of a habit chewing the nail or chewing the hardened skin surrounding the nail plate. |
| onychorrhexis | Split or brittle nails that have a series of lengthwise ridges giving a rough appearance to the surface of the nail plate. |
| Onychosis | any deformity or disease of the natural nails. |
| paronychia | bacterial inflammation of the tissues surrounding the nail. Redness, pus, and swelling are usually seen in the skin fold adjacent to the nail plate. |
| pincer nail | Also known as trumpet nail; increased crosswise curvature throughout the nail plate caused by an increased curvature of the matrix. The edges of the nail plate may curl around to form the shape of a trumpet or sharp cone at the free edge. |
| plicatured nail | also known as folded nail; a type of highly curved nail usually caused by injury to the matrix, but may be inherited. |
| Pseudomonas aeruginosa | common bacteria that can lead to a bacterial infection that appears as a green, yellow, or black discoloration on the nail bed. |
| pyogenic granuloma | severe inflammation of the nail in which a lump of red tissues grows up from the nail bed to the nail plate. |
| ridges | vertical lines running through the length of the natural nail plate that are caused by uneven growth of the nails, usually the result of normal aging. |
| splinter hemorrhage | hemorrhage caused by trauma or injury to the nail bed that damages the capillaries and allow small amounts of blood flow. |
| tineas pedis | also known as athlete's foot; medical term for fungal infections of the feet; red, itchy rash of the skin on the bottom of the feet and/or in between the toes, usually found between the fourth and fifth toe. |