porokeratosis

noun
po·ro·ker·a·to·sis | \-ˌker-ə-ˈtō-səs \

Medical Definition of porokeratosis 

: any of several often inherited skin disorders that arecharacterized by the proliferation of atypical keratinocytes and is marked by the presence of usually circular atrophic skin lesions which are surrounded by a ridgelike horny border

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