Term
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Definition
| Initial eruption that develops spontaneously as a direct result of the underlying disease |
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Term
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Definition
| Primary lesion. A small circumscribed elevation of the skin containing purulent material |
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Term
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Definition
| Primary lesion. A small, sold elevation of the skin up to 1 cm; can be palpated as a sold mass. |
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Term
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Definition
| Primary lesion. A larger solid elevation of the skin with a flattened top (> 1 cm) |
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Term
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Definition
| Primary lesion. A circumscribed, solid elevation > 1 cm in diameter that extend into deeper layers of the skin (lay term: "bump" or "lump") |
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Term
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Definition
| Primary lesion. A large mass that may involve any structure of the skin or SQ tissue |
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Term
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Definition
| Primary lesion. An epithelium-lined cavity containing fluid or a solid material. Usually smooth, well circumcribed, fluctuant to solid mass. Usually filled with cornified cellular debris or sebaceous or epithrachial secretions. |
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Term
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Definition
| Primary lesion. A small, sharply circumscribed elevation of the skin filled with clear fluid. |
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Term
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Definition
| Primary lesion. A large (>1 cm) vesicle. |
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Term
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Definition
| Primary lesion. Bulla whose contents includes blood. |
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Term
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Definition
| Primary lesion. A sharply circumscribed, raised lesion consisting of edema that usually appears and disappears within minutes or hours; usually do not cause change in the overlying skin and hair. |
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Term
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Definition
| Primary lesion. A huge wheal in a region that is distensible. |
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Term
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Definition
| Primary lesion. A circumscribed, nonpalpable area characterized by a change in the color of the skin; < 1 cm in diameter. |
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Term
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Definition
| Primary lesion. A macule which is > 1 cm. |
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Term
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Definition
| Primary lesion. A circumscribed developmental defect in the skin; may arise from any skin component(s). |
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Term
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Definition
| Evolve from primary lesions or are artifacts induced by the patient or by external factors such as trauma (usually self-induced trauma from pruritus) or medications |
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Term
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Definition
| Secondary lesion. A special type of scale arranged in a circular rim of loose keratin flakes or peeling keratin. It represents the remnants of the roof of a vesicle, bulla, pustule, or papule. |
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Term
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Definition
| Secondary lesion. Dried exudate, serum, blood, medications or excessive scale on the skin surface; often sequel to a pustule (lay term: "scab") |
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Term
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Definition
| Secondary lesion. Superficial (epidermal) erosions or ulcers caused by self-trauma. May have a linear pattern. |
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Term
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Definition
| Secondary lesion. Thickening of the epidermis and/or dermis with exaggeration of the superficial skin markings. |
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Term
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Definition
| Secondary lesion. A shallow epidermal defect that does not penetrate the epidermal basal cell layer. Usually results from epidermal diseases or self-inflicted trauma. |
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Term
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Definition
| Secondary lesion. A break in the epidermis with exposure of the dermis. Result of a deep pathological process. |
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Term
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Definition
| Secondary lesion. An area of fibrous tissue that has replaced the damaged dermis or subcutaneous tissue. Most are alopecic, atrophic and depigmented or hyperpigmented. |
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Term
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Definition
| Secondary lesion. A linear cleavage into the epidermis or through the epidermis into the dermis. They occur when the skin is thick and inelastic and then subjected to sudden swelling from inflammation or trauma. |
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Term
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Definition
| Secondary lesion. A thickened, rough, hyperkeratosis, alopecic, often lichenified plaque. Most occur over bony prominences and result from chronic, low-grade pressure |
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Term
| Alopecia. Primary and secondary. |
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Definition
| Partial or complete loss of hair. |
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Term
| Scale. Primary and secondary. |
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Definition
| Accumulation of loose fragments of the stratum corneum. |
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Term
| Comedomes. Primary and secondary. |
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Definition
| Dilated hair follicle filled with cornified cells and sebaceous debris. |
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Term
| Follicular cast. Primary and secondary. |
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Definition
| Accumulation of keratin and follicular material that adheres to the hair shaft extending above the surface of the follicular ostia. |
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Term
| Hypopigmentation. Primary and secondary. |
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Definition
| Reduction or total loss of pigment in the skin or in areas that should be pigmented. |
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Term
| Hyperpigmentation. Primary and secondary. |
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Definition
| Increase in the amount of pigment of the skin or hair. |
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Term
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Definition
| An unpleasant sensation within the skin that produces the desire to scratch |
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Term
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Definition
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Term
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Definition
| Dry scales and dull hair coat |
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Term
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Definition
| Greasy/sticky scales and hair coat |
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Term
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Definition
| Sinus or abnormal passage leading from an abscess to the surface |
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Term
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Definition
| A circumscribed SQ collection of pus |
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Term
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Definition
| Relating to the chemically active rays of the electromagnetic spectrum |
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Term
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Definition
| Redness of the skin associated with inflammation |
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Term
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Definition
| Inflammation secondary to rupture of a hair follicle; usually pyogranulomatous |
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Term
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Definition
| Superficial, ulcerative inflammatory process caused by trauma; also referred to as acute moist dermatitis |
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Term
| Pyotraumatic folliculitis |
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Definition
| Deep suppurative folliculitis usually a manifestation of deep pyoderma |
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Term
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Definition
| Surface irritation and inflammation caused by friction trauma of skin rubbing against skin; also referred to as "skin fold dermatitis" |
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