dermatologic disorders
Description of Skin Lesions
Lesion Type (Primary Morphology)
 10 mm in diameter. Macules represent a change in color and are not raised or depressed compared to the skin surface. A patch is a large macule. Examples include freckles, flat moles, tattoos, and Capillary Malformations , and the rashes of 10 mm in diameter that can be felt or palpated. Examples include Moles , 10 mm in diameter that are elevated or depressed compared to the skin surface. Plaques may be flat topped or rounded. Lesions of Psoriasis and are firm papules or lesions that extend into the dermis or subcutaneous tissue. Examples include Cutaneous Cysts , 10 mm in diameter. Vesicles are characteristic of herpes infections, Allergic contact dermatitis (ACD) , and some autoimmune blistering disorders (eg, 10 mm in diameter. These may be caused by burns, bites, Irritant contact dermatitis (ICD) or are vesicles that contain pus. Pustules are common in bacterial infections and folliculitis and may arise in some inflammatory disorders including Subtypes of Psoriasis . Urticaria None is heaped-up accumulations of horny epithelium (stratum corneum) that occur in disorders such as Psoriasis , consist of dried serum, blood, or pus. Crusting can occur in inflammatory or infectious skin diseases (eg, Impetigo and Ecthyma ). Erosionsare open areas of skin that result from loss of part or all of the epidermis. Erosions can be traumatic or can occur with various inflammatory or infectious skin diseases. An excoriation is a linear erosion caused by scratching, rubbing, or picking. result from loss of the epidermis and at least part of the dermis. Causes include Stasis Dermatitis , physical trauma with or without vascular compromise (eg, caused by are nonblanchable punctate foci of hemorrhage. Causes include platelet abnormalities (eg, thrombocytopenia, Overview of Platelet Disorders ), Purpurais a larger area of hemorrhage that may be palpable. Purpura does not blanch. Palpable purpura is considered the hallmark of leukocytoclastic vasculitis. Purpura may indicate a coagulopathy. Large areas of purpura may be called ecchymoses or, colloquially, bruises. is thinning of the skin, which may appear dry and wrinkled, resembling cigarette paper. Atrophy may be caused by chronic sun exposure, aging, and some inflammatory and neoplastic skin diseases, including Cutaneous T-cell Lymphomas (CTCL) and are areas of fibrosis that replace normal skin after injury. Some scars become hypertrophic or thickened and raised. Keloids are hypertrophic scars that extend beyond the original wound margin. are foci of small, permanently dilated blood vessels that may occur in areas of sun damage, Rosacea , systemic diseases (especially 