partial or complete loss of hair. Alopecia may result from the normal aging, a reaction to a medication such as anticancer medications, an endocrine disorder, or some skin disease.
the surgical removal of a part of the body or limb or a part of a limb; performed to treat recurrent infections or gangrene of a limb.
an open comedo, caused by accumulation of keratin and sebum whithin the opening of a hair follicle.
a bluish-black discoloration of an area of the skin or mucous membrane caused by an escape of blood into the tissues as a result of an injury to the area.
a circumscribed inflammation of the skin and deeper tissues that contains pus, which eventually discharges to the skin surface.
a diffuse acute infection of the skin and subcaneous tissue, characterized by localized heat, deep redness, pain, and swelling.
a modified sweat gland that lubricates the skin of the ear canal with a yellowish-brown waxy substance called cerumen (or ear wax).
confined to a limited space or well-defined area (as if a circle were drawn around it).
the protein substance that forms the glistening inelastic fibers of connective tissue such as tendons, ligaments, and fascia.
the typical lesion of acne vulgaris, caused by accumulation of keratin and sebum within the opening of a hair follicle (closed comedo= whitehead; open comedo= blackhead).
a noninvasive treatment that uses subfreezing temperature to freeze and destroy the tissue. Coolants such as liquid nitrogen are used in the metal probe.
the process of scraping material from the wall of a cavity or other surgace for the purpose of removing abnormal tissue or unwanted material.
removal of debris, foreign objects, and damaged or necrotic tissue from a wound in order to prevent infection and to promote healing.
a bluish-black discoloration of an area of the skin or mucous membrane caused by an escape of blood into the tissues as a result of injury to the area; also known as a bruise or a black-and-blue mark.
a technique that uses an electrical spark to burn and destroy tissue; used primarily for the removal of surface lesions.
a cyst filled with cheesy material composed of sebum and epithelial deris that has formed in the duct of a sebaceous gland; also known as a sebaceous cyst.
redness of the skin due to capillary dilatation. An exampleof erythema is nervous blushing or a mild sunburn.
peeling or sloughing off of tissue cells, as in peeling of the skin after a severe sunburn.
an abnormal passageway between two tubular organs (e.g. rectum and vagina) or from an organ to the body surface.
death of tissue, most often involving extremeties. Gangrene is usually the result of ischemia (loss of blood supply to an area), bacterial invasion, and subsequent putrefaction (decaying) of the tissue.
a benign (nonmalignant) tumor that consists of a mass of blood vessels and has a reddish-purple color.
a natural anticoagulant substance produced by the body tissues; heparin is also produced in laboratories for therapeutic use as heparin sodium.
macrophage; a large phagocytic cell (cell that ingests microorganisms, other cells, and foreign particles) occurring in the walls of blood vessels and loose connective tissue.
circumscribed, slightly elevated lesions of the skin that are paler in the venter than its surrounding edges; see wheal.
and inherited dermatological condition in which the skin is dry, hyperkeratotic (hardened, and fissured- resembling fish scales.
the body system consisting of the skin, hair, nails, sweat glands, and sebaceous glands.
a hard fibrous protein found in the epidermis, hair, nails, enamel of the teeth, and horns of animals.
soft, very fine hair that covers the body of the developing fetus; this hairy coating is almost completely fone by birth.
a large phagocytic (cell that ingests microorganisms, other cells and foreign particles) occurring in the walls of blood vessels and loose connective tissue.
a cell (found within the connective tissue) that contains heparin and histamine; these substances are released from the mast cell in response to injury and infection.
a black or dark pigment (produced by melanocytes within the epidermis) that contributes color to the skin and helps to filter ultraviolet light.
one of the many small glands located in the dermis; its secretions provide oil to the hair and surrounding skin.
separation of a fingernail from its bed, beginning at the free margin this condition is associated with dermatitis of the hand, psoriasis, and fungal infections.
a small, stalklike growth that protrudes upward or outward from a mucous membrane surface, resembling a mushroom stalk.
openings of the skin through which substances such as water,salts, and some fatty substances are excreted.
an inflammation, sore, or ulcer in the skin over a bony prominence of the body, resulting from loss of blood supply and oxygen to the area due to prolonged pressure on the body part; also known as decubitis ulcer or pressure sore.
a group of bleeding disorders characterized by bleeding into the skin and mucous membranes; small, pinpoint hemorrhages are known as petechia and larger hemorrhagic areas are known as ecchymoses or bruises.
a cyst filled with a cheesy material consisting of sebum and epithelial deris that has formed in the duct of a sebaceous gland; also known as an epidermoid cyst.
an oil gland located in the dermis; its secreations provide oil to the hair and surrounding skin.
a small brownish or flesh-colored outgrowth of skin occurring frequently on the neck; also known as a cuaneous papilloma.
the single layer of flattened platelike cells that cover internal and external body surfaces.
the layer of skin where new cells are continually being reproduced, pushing older cells toward the outermost surface of the skin.
the outermost layer of the epidermis (consisting of dead cells that have converted to keratin), which continually sloughs off or flakes away; known as the keratinized (or "horny") cell layer. (kerat/o = horn)
linear tears in the dermis that result from overstretching from rapid growth. They begin as pinkish-blue streaks with jagged edges and may be accompanied by itching. As they heal and lose their color, they remain as silvery-white scar lines, also known as stria
one of the tiny structures within the dermis that produces sweat, which carries waste products to the surface of the skin for excretion; also known as a sudoriferous gland.
the permanent dialation of groups of superficial capillaries and venules. these dilated vessels may be visable through the skin as tiny red lines. Common causes include but are not limited to rosacea, elevated estrogen levels, and actinic damage.
a reaction of the skin in which there is an appearance of smooth slightly elevated patches (wheals) that are redder or paler than the surrounding skin and often accompanied by severe itching (pruritus).
a skin disorder characterized by nonpigmented white patches of skin of varying sizes that are surrounded by skin with normal pigmentation.
a circumscribed, slightly elevated lesion of the skin that is paler in the center than its surrounding edges; hives.
a closed comedo caused by accumulation of keratin and sebum within the opening of a hair follicle; the content within is not easily expressed.