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abscess acne anatomy angioma bacteria body cancer cancerous capsule care cavity clinic cyst cysts dermatofibromas dermatologist dermatology dermis diagram disease epidermis fatty fibrosis follicle folliculitis gland hair health healthcare illustration infect infection inflammation injury integumentary keratoacanthoma keratosis lesions medical medicine non peralis poster presentation problem pus pustule rupture sac sebaceous sebum section skin steatocystomas surgery system tissue treatment