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an injury in which superficial layers of skin are scraped or rubbed away


a closed pocket containing pus that is caused by a bacterial infection

acne vulgaris

a chronic inflammatory disease characterized by pustular eruptions of the skin caused by an overproduction of sebum

actinis keratosis

a precancerous skin growth that occurs on sun-damaged skin

adipose tissue



a genetic condition characterized by a deficiency or the absence of pigment in the skin, hair, and irises of the eyes


the partial or complete loss of hair, most commonly on the scalp

alopecia areata

an autoimmune disorder that attacks the hair follicles, causing well-defined bald areas on the scalp or elsewhere on the body

alopecia capitis totalis

an uncommon condition characterized by the loss of all the hair on the scalp

alopecia universalis

the total loss of hair on all parts of the body


the abnormal condition of lacking sweat in response to heat

arrector pili

tiny muscle fibers attached to the hair follicles that cause the hair to stand erect

basal cell carcinoma

a malignant tumor of the basal cell layer of the epidermis; this is the most common and least harmful type of skin cancer because it is slow growing and rarely spreads to other parts of the body


the removal of a small piece of living tissue for examination to confirm or establish a diagnosis


the surgical reduction of the upper and lower eyelids by removing excess fat, skin, and muscle


a formulation of botulinum toxin type A; injections that temporarily block the nerve signals to the injected muscle, reduce moderate to severe frown lines for up to 3-4 months


a large blister that is usually more than 0.5 cm in diameter


an injury to body tissues caused by heat, flame, electricity, sun, chemicals, or radiation


a thickening of part of the skin on the hands or feet caused by repeated rubbing


a cluster of connected furuncles (boils)


the destruction of tissue by burning


an acute, rapidly spreading infection within the connective tissues that is characterized by malaise, swelling, warmth, and red streaks


the use of chemicals to remove the outer layers of skin to treat acne scarring, fine wrinkling, and keratoses


a pigmentation disorder characterized by brownish spots on the face


a normal scar resulting from the healing of a wound


abnormal curving of the nails that is often accompanied by enlargement of the fingertips


a tough, yet flexible, fibrous protein material found in the skin and in the bones, cartilage, tendons, and ligaments

collagen replacement therapy

a form of soft-tissue augmentation used to soften facial lines or scars or to make lips appear fuller


a noninfected lesion formed by the buildup of sebum and keratin in a hair follicle

contact dermatitis (CD)

a localized allergic response caused by contact with an irritant


an injury to underlying tissues without breaking the skin and is characterized by discoloration and pain

cosmetic surgeon

a physician who specializes in the surgical restoration and reconstruction of body structures


a collection of dried serum and cellular debris; a scab


the destruction or elimination of abnormal tissue cells through the application of extreme cold by using liquid nitrogen


the removal of material from the surface by scraping


relating to the skin


a narrow band of epidermis attached to the surface of the nail just in front of the root, protecting the new keratin cells as they form


an abnormal sac containing gas, fluid, or a semisolid material


the removal of dirt, foreign objects, damaged tissue, and cellular debris from a wound to prevent infection and to promote healing


a form of abrasion involving the use of a revolving wire brush or sandpaper


an inflammation of the skin


a physician who specializes in diagnosing and treating disorders of the skin


the replacement of damaged skin with healthy tissue taken from a donor site on the patient's body


a general term used to denote skin lesions or eruptions of any type that are not associated with inflammation


the thick layer of living tissue directly below the epidermis


profuse sweating

dysplastic nevi

atypical moles that may develop into skin cancer


a large, irregular area of purplish discoloration due to bleeding under the skin; a bruise


a form of persistent or recurring dermatitis that is usually characterized by redness, itching, and dryness, with possible blistering, cracking, oozing, or bleeding


the use of electric current to destroy hair follicles in order to produce the relatively permanent removal of undesired hair


the outermost layer of the skin

epithelial tissues

form a protective covering for all of the internal and external surfaces of the body


redness of the skin due to capillary dilation


abnormal redness of the entire skin surface

exfoliative cytology

a technique in which cells are scraped from the tissue and examined under a microscope

exfoliative dermatitis

a condition in which there is widespread scaling of the skin, often with pruritus, erythroderma, and hair loss

female pattern baldness

a condition in which the hair thins in the front and on the sides of the scalp and sometimes on the crown

first-degree burn

superficial burn; no blisters, superficial damage to the epidermis


a groove or crack-like break in the skin


an inflammation of the hair follicles


large, tender, swollen areas caused by a staphylococcal infection around hair follicles or sebaceous glands; boils


tissue necrosis most commonly caused by a loss of circulation to the affected tissues

granulation tissue

the tissue that normally forms during the healing of a wound


a general term used to describe small, knot-like swellings of granulation tissue in the epidermis


rod-like structures composed of tightly fused, dead protein cells filled with hard keratin

hair follicles

the sacs that hold the root of the hair fibers


a swelling of clotted blood trapped in the tissues, usually caused by an injury


an anticoagulant released in response to an injury


the production and excretion of sweat


the presence of excessive body and facial hair in women, usually occurring in a male pattern


released in response to allergens, causes the signs of an allergic response, including itching and increased mucus secretion


a condition of sweating in one area or over the whole body


a group of hereditary disorders characterized by dry, thickened, and scaly skin


a highly contagious bacterial skin infection that commonly occurs in children

incision and drainage (I&D)

involves incision (cutting open) of a lesion, such as an abscess, and draining the contents


the dwelling of microscopic parasites on external surface tissue


an abnormally raised or thickened scar that expands beyond the boundaries of the incision


a fibrous, water-repellant protein


any skin growth, such as a wart or a callus, in which there is overgrowth and thickening of the skin


a malformation of the nails in which the outer surface is concave or scooped out like the bowl of a spoon


a torn or jagged wound, or an accidental cut wound


light amplification by stimulated emission of radiation


a pathologic change of the tissues due to disease or injury


the surgical removal of fat beneath the skin


a chronic abnormal condition that is characterized by the accumulation of fat and fluid in the tissues just under the skin of the hips and legs


fat cells


a benign, slow-growing fatty tumor located between the skin and the muscle layer


the surgical removal of fat beneath the skin with the aid of suction


a pale half-moon-shaped region at every nail root that is generally most easily seen in the thumbnail

lupus erythematosus

an autoimmune disorder characterized by a red, scaly rash on the face and upper trunk


a discolored, flat spot that is less than 1 cm in diameter

male pattern baldness

a common hair-loss pattern in men, with the hairline receding from the front to the back until only a horseshoe-shaped area of hair remains in the back and at the temples

malignant melanoma

a type of skin cancer that occurs in the melanocytes; this is the most serious type of skin cancer

mast cells

found in the connective tissue of the dermis; respond to injury, infection, or allergy by producing and releasing substances, including heparin and histamine


cells that produce and contain a dark brown to black pigment called melanin


any condition of unusual deposits of black pigment in different parts of the body


an intensely itchy rash caused by blockage of the sweat glands by bacteria and dead cells; also known as heat rash and prickly heat (do not confuse with malaria)

Mohs surgery

a technique used to treat skin cancer

nail root

fastens the nail to the finger or toe by fitting into a groove in the skin


protect the dorsal surface of the last bone of each toe and finger

necrotizing fascilitis

a severe infection caused by Group A strep bacteria


small, dark skin growths that develop from melanocytes in the skin; also known as moles


a solid, raised skin lesion that is larger than 0.5 cm in diameter and deeper than a papule


an inflammation of the matrix of the nail that usually results in the loss of the nail


the edges of a toenail, usually on the big toe, curve inward and cut into the skin; also known as an ingrown toenail


a fungal infection of the nail


nail biting or nail eating


a benign, superficial wart-like growth on the epithelial tissue or elsewhere in the body


a small, raised red lesion that is less than 0.5 cm in diameter and does not contain puss


an acute or chronic infection of the skin fold around a nail


an infestation with lice

pediculosis capitis

an infestation with head lice

pediculosis corporis

an infestation with body lice

pediculosis pubis

an infestation with lice in the pubic hair and pubic region


secreted by sweat glands and is made up of 99% water plus some salt and metabolic waste products; sweat


sweating; one way in which the body excretes excess water


very small, pinpoint hemorrhages that are less than 2 mm in diameter


a scaly, solid raised area of closely spaced papules


a general term used most commonly to describe a mushroom-like growth from the surface of a mucous membrane, such a polyp in the nose


openings on the surface of the skin for the ducts of the sweat glands

port-wine stain

a large, reddish-purple discoloration of the face or neck

pressure sore

an ulcerated area in which prolonged pressure has caused tissue death


also known as itching and is associated with most forms of dermatitis


a common skin disorder characterized by flare-ups in which red papules covered with silvery scales occur on the elbows, knees, scalp, back, or buttocks

puncture wound

a deep hole made by a sharp object such as a nail


the appearance of multiple purple discolorations on the skin caused by bleeding underneath the skin


producing or containing pus


a small, circumscribed lesion containing pus; a pimple


any acute, inflammatory, pus-forming bacterial skin infection such as impetigo


a condition characterized by hyperplasia (overgrowth) of the tissues of the nose and is associated with advanced rosacea; usually occurs in older men


the surgical removal of excess skin and fat around the face to eliminate wrinkles; also known as a facelift


characterized by tiny red pimples and broken blood vessels


a skin infection caused by an infestation with the itch mite


flakes or dry patches made up of excess dead epidermal cells


an autoimmune disorder in which the connective tissues become thickened and hardened, causing the skin to become hard and swollen


used in the treatment of spider veins

sebaceous cyst

a closed sac associated with a sebaceous gland that is found just under the skin

sebaceous glands

secrete sebum (oil) that lubricates the skin and discourages the growth of bacteria on the skin


overactivity of the sebaceous glands that results in the production of an excessive amount of sebum

seborrheic dermatitis

an inflammation that causes scaling and itching of the upper layers of the skin or scalp

seborrheic keratosis

a benign skin growth that has a waxy or "pasted on" look


released through ducts opening into the hair follicles

second-degree burn

partial thickness burn; blisters, damage to the epidermis and dermis

sensory nerve endings

sensory receptors stimuli such as touch, temperature, pain, and pressure


covers the external surfaces of the body

skin cancer

a harmful, malignant growth on the skin

skin tags

small, flesh-colored or light brown polyps that hand from the body by fine stalks

sleep hyperhidrosis

the occurrence of excessive hyperhidrosis during sleep; also known as night sweats

squamous cell carcinoma

originates as a malignant tumor of the scaly squamous cells of the epithelium; however, it can quickly spread to other body systems

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