ABSTRACT
Generally considered a part of the scarring alopecia group, alopecia mucinosa is a rare condition without a clear etiology. It usually starts as non-cicatricial reversible alopecia that rarely progresses to a cicatricial type. Graham Little-Piccardi-Lasseur syndrome (GLPLS) is a rare dermatosis of unknown incidence. Presently, GLPLS is considered an uncommon variant of lichen planus. Keratosis follicularis spinulosa decalvans (KFSD) is a rare form of hereditary alopecia of unknown prevalence. Most cases are X-linked, but sporadic cases of autosomal inherence have also been reported. KFSD is characterized by diffuse keratosis pilaris, scarring alopecia of the scalp, eyebrows, and eyelashes with a variable phenotype among affected patients. Pseudopelade of Brocq (PPB) is a rare slowly progressive scarring alopecia. PPB may mimic alopecia areata, lichen planopilaris, discoid lupus, and central centrifugal alopecia. Erosive pustular dermatosis is an inflammatory disease characterized by the presence of crusts, erosions, and pustules that coalesce to form large areas of scarring alopecia.
