Lichen planopilaris, also called lichen ruber follicularis, evokes perifollicular erythema and sometimes hyperkeratotic follicular papules. A violaceous discoloration of the scalp may be observed.

lichen planopilaris, pseudopelade of Brocq, central centrifugal cicatricial alopecia, discoid lupus erythematosus, folliculitis decalvans, and acne keloidalis. These diseases can usually be ...