Circumscribed lesion of <5 mm in diameter characterized by flatness and usually discolored (often red)
Circumscribed lesion of >5 mm in diameter characterized by flatness and usually discolored (often red)
Elevated dome-shaped or flat-topped lesion <5 mm across.
Elevated lesion with spherical contour >5 mm across.
Elevated flat-topped lesion, usually >5 mm across (may be caused by coalescent papules).
Fluid-filled raised lesion <5 mm across.
Fluid-filled raised lesion >5 mm across.
Common term used for vesicle or bulla.
Discrete, pus-filled, raised lesion.
Itchy, transient, elevated lesion with variable blanching and erythema formed as the result of dermal edema.
Dry, horny, plate-like excrescence; usually the result of imperfect cornification (i.e., keratinization).
Thickened and rough skin characterized by prominent skin markings; usually the result of repeated rubbing in susceptible persons.
Traumatic lesion characterized by breakage of the epidermis, causing a raw linear area (i.e., a deep scratch)
Separation of nail plate from nail bed.
Thickening of the stratum corneum, often associated with a qualitative abnormality of the keratin.
Modes of keratinization characterized by the retention of the nuclei in the stratum corneum. On mucous membranes, parakeratosis is normal.
Hyperplasia of the stratum granulosum, often due to intense rubbing.
Diffuse epidermal hyperplasia.
Surface elevation caused by hyperplasia and enlargement of contiguous dermal papillae.
DYSPLASIA, Abnormal keratinization occurring prematurely within individual cells or groups of cells below the stratum granulosum..
Loss of intercellular connections resulting in loss of cohesion between keratinocytes.
Intercellular edema of the epidermis.
Hydropic swelling (ballooning):
Intracellular edema of keratinocytes.
Infiltration of the epidermis by inflammatory or circulating blood cells.
Discontinuity of the skin exhibiting incomplete loss of the epidermis.
Discontinuity of the skin exhibiting complete loss of the epidermis and often of portions of the dermis and even subcutaneous fat.
Formation of vacuoles within or adjacent to cells; often refers to basal cell-basement membrane zone area.
Referring to a linear pattern of melanocyte proliferation within the epidermal basal cell layer. Lentiginous melanocytic hyperplasia can occur as a reactive change or as part of a neoplasm of melanocytes.