In dermatology, a<unk>  or bull's-eye<unk> , named for its resemblance to the bull's-eye of a shooting<unk> , is a rash with central clearing. It occurs in several diseases, as follows: *<unk> s are the typical<unk> s of erythema multiforme, in which a vesicle is surrounded by an often hemorrhagic maculopapule. Erythema multiforme is often self-limited, of acute onset, resolves in three to six weeks, and has a cyclical pattern. Its<unk> s are multiform (polymorphous) and include macules, papules, vesicles, and bullae. *<unk> s are also typical of Lyme disease. In the context of Lyme disease, the<unk>  is synonymous with erythema migrans (erythema chronicum migrans), although not everyone who gets Lyme disease will have a<unk> -shaped rash, and some will have no rash at all.
Target lesion
Lesion
Cancer cluster
Toxicity class
Order of Saint Lazarus 
Field cancerization
Sexology
Focus of infection