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- Acne - a chronic disorder of the hair follicles and sebaceous glands. Acne is characterized by pimple outbreaks, cysts, infected abscesses, and sometimes scarring.
- Albinism - a rare, inherited disorder characterized by a total lack of melanin (skin pigment) in the skin.
- Angioma - a benign tumor in the skin, made up of blood or lymph vessels.
- Atrophic skin - skin that is thin and wrinkled.
- Basal cells - these cells are found in the outer layer of skin. Basal cells are responsible for producing the squamous cells in the skin.
- Basal cell carcinoma - the most common form of skin cancer, characterized by small, shiny, raised bumps on the skin that may bleed.
- Birth marks - areas of discolored and/or raised skin that are present at birth or shortly afterward.
- Biopsy - the procedure of removing tissue for examination under a microscope.
- Blister - a fluid-filled bump.
- Boil - tender, swollen areas that form around hair follicles.
- Candidiasis (Also called yeast infection.) - a skin infection caused by yeast that can occur in the skin folds, the navel, vagina, penis, mouth, and nail beds.
- Carbuncles - clusters of boils on the skin.
- Cavernous hemangioma - a raised, red or purple mark in the skin, made up of enlarged blood vessels.
- Cellulitis - a bacterial infection of the skin that is characterized by swelling and tenderness.
- Cold sore - small blisters around and in the mouth caused by the herpes simplex virus.
- Collagen - a protein produced by skin cells that provide strength and resilience to the skin.
- Crust (Also called scab.) - a formation of dried blood, pus, or other skin fluid over a break in the skin.
- Cryosurgery - a surgery technique that uses liquid nitrogen to freeze the skin.
- Cyst - a deep cavity below the skin that is filled with fluid.
- Dermatitis - a number of skin conditions that inflame the skin.
- Dermatofibroma - small, red or brown bumps in the skin.
- Dermis - the middle layer of skin, which is made up of blood vessels, lymph vessels, hair follicles, and sweat glands.
- Dermoid cyst - a benign tumor made up of hairs, sweat glands, and sebaceous glands.
- Epidermis - the outer layer of skin, which is made up of the horny layer, squamous cells and basal cells.
- Erysipelas - a skin infection that usually affects the arms, legs, or face, characterized by shiny, red areas, small blisters, and swollen lymph nodes.
- Erythema multiforme - a skin condition characterized by symmetrically positioned, red, raised skin areas all over the body.
- Erythema nodosum - a skin condition, characterized by red bumps that usually appear on the shins.
- Excoriation - a hollowed-out or linear area of the skin covered by a crust.
- Folliculitis - an inflammation of the hair follicles due to an infection.
- Freckles - darkened, flat spots that typically appear only on sun-exposed areas of skin.
- Granuloma annulare - a chronic skin condition characterized by small, raised bumps that form a ring with a normal or sunken center.
- Herpes zoster (Also called shingles.) - a common viral infection of the nerves, characterized by a painful skin rash of small blisters anywhere on the body.
- Hives (Also called wheals.) - a pink swelling of the skin.
- Impetigo - a skin infection characterized by pus-filled blisters.
- Keloids - smooth, pink, raised, fibrous growths on the skin that form over healed wounds.
- Keratinocytes (Also called squamous cells.) - these are the primary cell types found in the epidermis -- the outer layer of skin.
- Keratoacanthomas - round, flesh-colored growths with craters that contain a pasty material.
- Keratosis pilaris - a common skin condition characterized by small, pointed pimples.
- Lice - tiny insects that can infest the skin; characterized by intense itching.
- Lichenification - skin that has thickened or hardened due to constant scratching or rubbing.
- Lipomas - round or oval lumps under the skin caused by fatty deposits.
- Lymphangioma - a raised, yellow-tan or red mark in the skin, made up of enlarged lymphatic vessels.
- Macular stains (Also called angel's kisses or stork bites.) - faint, red marks that appear in the skin at birth. Angel's kisses are marks on the forehead and eyelids. Stork bites are marks on the back of the neck.
- Macule - the smaller version of a patch - a flat discolored spot.
- Malignant melanoma - a rare, but deadly skin cancer that can begin as a mole that turns cancerous.
- Melanocytes - cells present in the epidermis that produce melanin (skin pigment).
- Melasma - dark, brown symmetrical patches of pigment on the face.
- Moles - small skin marks caused by pigment-producing cells in the skin.
- Nodule (Also called papule.) - a solid, raised bump.
- Paranychia - a skin infection around a finger or toenail.
- Patch - a flat, discolored spot.
- Pityriasis rosea - a common skin condition characterized by scaly, pink, and inflamed skin.
- Port-wine stains (Also called nevi flammeus.) - permanent flat, pink, red, or purple marks on the skin.
- Prickly heat - a rash caused by trapped sweat under the skin.
- Psoriasis - a chronic skin condition characterized by inflamed, red, raised areas that develop silvery scales.
- Pustule (Also called pimple.) - inflamed lesions that look like pink bumps.
- Pyogenic granuloma - red, brown, or bluish-black raised marks caused by excessive growth of capillaries.
- Raised bumps - bumps that stick out above the skin surface.
- Ringworm - a fungal skin infection characterized by ring-shaped, red, scaly, or blistery patches.
- Rosacea - a common skin condition characterized by redness, pimples, and broken blood vessels.
- Salicylic acid - a keratolytic drug (a drug that removes the outer layer of skin) used to treat various skin conditions.
- Sarcoidosis - an inflammation of the lymph nodes and other organs.
- Scabies - an infestation of mites in the skin characterized by small pimples that itch.
- Scales - dead skin cells that look like flakes or dry skin.
- Scar - fibrous tissue that has formed after a skin injury.
- Sebaceous glands - glands in the skin that secrete oil to the surface of the skin.
- Seborrheic keratosis - flesh-colored, brown, or black wart-like spots.
- Skin tags - soft, small, flesh-colored skin flaps on the neck, armpits, or groin.
- Spider angioma - a bright red mark with a distinct dark spot in the skin.
- Squamous cell carcinoma - a form of skin cancer that affects about 20 percent of patients with skin cancer. This highly treatable cancer is characterized by red, scaly skin that becomes an open sore.
- Strawberry mark (Also called capillary hemangioma.) - a raised, strawberry red mark in the skin.
- Subcutaneous layer - the deepest layer of skin; consists of collagen and fat cells.
- Tinea versicolor - a common fungal skin infection characterized by white or light brown patches on the skin.
- Toxic epidermal necrolysis - a life-threatening skin disorder characterized by blistering and peeling of the top layer of skin.
- Tretinoin - a drug which is chemically related to vitamin A; used to treat acne and other scaly skin disorders.
- Urushiol - resin in poison ivy plants that causes a skin reaction.
- Vitiligo - smooth, white patches in the skin caused by the loss of pigment-producing cells.
- Wart - a non-cancerous skin growth caused by a virus.
A Mini Dictionary of Dermatology














