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a lesion of acne vulgaris caused by an accumulation of sebum (open comedo = blackhead; closed comedo = whitehead)
decubitus ulcer (decub.)
an ulcer, sore, or inflammation of the skin that results from prolonged pressure on the skin (generally this occur over the bony parts of the body when a person lays in the same position for long periods of time; also known as bed sores or pressure ulcers or pressure sores)
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