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A wasting; a decrease in size of an organ or tissue. Atrophy may result from death and resorption of cells, diminished cellular proliferation, pressure, ischemia, malnutrition, decreased activity, or hormonal changes. |
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| A large blister or skin vesicle filled with fluid; a bleb. |
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An abscess of the skin, formed by the merger of two or more boils (furuncles). |
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| A spreading bacterial infection of the skin and subcutaneous tissues, usually caused by streptococcal or staphylococcal infections in adults (and occasionally by Haemophilus species in children). |
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1. Dried serum, pus, or blood on the skin surface. Crusts are seen in diseases in which the skin weeps, such as eczema, impetigo, and seborrhea. They are often yellow-brown, dirty cream-colored, or honey-colored.
2. An outer covering or coat. |
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A closed sac or pouch, with a definite wall, that contains fluid, semifluid, or solid material. It is usually an abnormal structure resulting from developmental anomalies, obstruction of ducts, or parasitic infection. |
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An inflammatory rash marked by itching and redness.
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1. An eating away of tissue.
2. External or internal destruction of a surface layer by physical or inflammatory processes. |
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An abrasion of the skin or of the surface of other organs by scratching, traumatic injury, chemicals, burns, or other causes. On the skin, the lesion is typically linear and scaly. |
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| A groove, natural division, cleft, slit, or deep furrow in the brain, liver, spinal cord, and other organs. |
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| (Boil) A tender, dome-shaped skin lesion, typically caused by infection around a hair follicle with Staphylococcus aureus. |
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| An exuberant scar that forms at the site of an injury (or an incision) and spreads beyond the borders of the original lesion. The scar is made up of a swirling mass of collagen fibers and fibroblasts. Grossly it appears to have a shiny surface and a rubbery consistency. |
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1. Cutaneous thickening and hardening from continued irritation.
2. The changing of an eruption into one resembling a lichen. |
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Itch; a tingling or faintly burning skin sensation that prompts a person to rub or scratch. It may be a symptom of a disease process, such as an allergic response or hyperbilirubinemia, or it may be due to emotional factors.
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| A small dry flake, shed from the upper layers of skin. Some shedding of skin is normal; scale increases in diseases like pityriasis rosea, psoriasis, and tinea pedis, and after scratching the skin. |
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| A mark left in the skin or an internal organ by the healing of a wound, sore, or injury because of replacement by connective tissue of the injured tissue. Scars may result from wounds that have healed, lesions of diseases, or surgical operations. When it first develops, a scar is red or purple, and later becomes white and glistening. |
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A lesion of the skin or mucous membranes marked by inflammation, necrosis, and sloughing of damaged tissues. A wide variety of insults may produce ulcers, including trauma, caustic chemicals, intense heat or cold, arterial or venous stasis, cancers, drugs (e.g, nonsteroidal anti-inflammatory drugs), and infectious agents such as Herpes simplex or Helicobacter pylori. |
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| Multiple swollen raised areas on the skin that are intensely itchy and last up to 24 hr; they may appear primarily on the chest, back, extremities, face, or scalp. |
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