BIOL 4010 Lecture Notes - Lecture 22: Lesion, Hypersensitivity, Comedo
Lichenification: thickening of skin, skin lines are prominent. Chronic & persistent: excoriations: openings or breaks in skin, linear, secondary to scratching/itching. Fissures: narrow opening or line of breakage made by cracking or splitting. Consist of dilated hair follicles filled with skin debris, bacteria & oil: petechia, purpura, ecchymoses. Petechia <3mm; purprua 3-1cm; echymoses >1cm: telangiectasia. Widened tiny blood vessels cause threadlike red lines or patterns on skin. Color of lesions: not if color changes with time or varies within lesion, white, brown/black, yellow- rxn due to antimalarials red, blue or grey- rxn due to metals. Skin tone categories: certain disorders are particular to each of skin tone categories of fitzpatrick scale, fitzpatrick scale: classifies patients into types. Lightest (type 1) to richly pigments (type 6: consider cultural factors when considering diagnosis & treatment of patients of different skin types & ethnicities. Cultural competent care is called ethnic-sensitive practice or ethnodermatology.