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Secondary Lesions

Terms in this set (5)

Crust
dried exudate/plasma on the skin (honey-colored crusted lesions in staphylococcal impetigo)
Scale
outer epidermal layers flaking off of lower skin layers as a result of tissue damage and/or infection(dermatophytic infections such as athlete's foot/skin conditions like psoriasis)
Purpura
rash of large purple spots that evolve from bleeding in skin layers (subcutaneous bleeding); doesn't turn white when skin is depressed (no blanching):measures 3-10 mm [bloodstream infections (septicemia/bacteremia); meningococcal meningitis, also seen in many noninfectious scenarios]
Petechiae
same as purport but smaller (less than 3mm); often described as pinpoint spots; arise when tiny capillaries burst [congenital cytomegalovirus infection, scarlet fever, bacterial endocarditis, excessive strain from vomiting or coughing/childbirth; drug reactions]
Ulcer
a sore or irregular size/shape that results as epidermal/dermal skin layers are destroyed [often develop when primary skin lesions become infected w/secondary infectious agents (ex. bacteria infect a chi pox vesicle due to a child scratching the rash) and begin to involve deeper skin layers; cutaneous anthrax]
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