title: Red face revisited: Disorders of hair growth and the pilosebaceous unit.
abstract: This paper reviews the recent literature on the diseases of the hair and pilosebaceous unit that may cause a red face. We discuss the epidemiology, clinicals, pathogenesis, and therapy of lichen planopilaris with its variants, discoid lupus erythematosus, folliculitis decalvans, dissecting folliculitis, acne keloidalis nuchae, pseudofolliculitis barbae, tinea capitis, tinea barbae, folliculitis of diverse causative factors and inflammatory follicular keratotic syndromes, ulerythema ophryogenes, atrophoderma vermiculatum, keratosis follicularis spinulosa decalvans, and folliculitis spinulosa decalvans.
authors.affiliation: Sector of Dermatology and Post-Graduation Course, University Hospital, and School of Medicine, Federal University of Rio de Janeiro, Rua Dona Mariana 143/C-32, Botafogo 22280-020, Rio de Janeiro, Brazil. Electronic address: ramos.e.silva@dermato.med.br.
authors.forename: Marcia
authors.initials: M
authors.lastname: Ramos-e-Silva
authors.affiliation: Sector of Dermatology and Post-Graduation Course, University Hospital, and School of Medicine, Federal University of Rio de Janeiro, Rua Dona Mariana 143/C-32, Botafogo 22280-020, Rio de Janeiro, Brazil.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Pirmez
mesh_terms: D000505:Alopecia / Q000175:diagnosis / Q000453:epidemiology; D004890:Erythema / Q000175:diagnosis / Q000453:epidemiology; D004954:Esthetics; D005260:Female; D005499:Folliculitis / Q000175:diagnosis / Q000453:epidemiology; D006197:Hair / Q000254:growth & development; D006201:Hair Diseases / Q000175:diagnosis* / Q000453:epidemiology* / Q000503:physiopathology; D018859:Hair Follicle / Q000503:physiopathology*; D006801:Humans; D015994:Incidence; D008010:Lichen Planus / Q000453:epidemiology / Q000503:physiopathology; D008297:Male; D011379:Prognosis; D018570:Risk Assessment; D012627:Sebaceous Glands / Q000503:physiopathology*; D012720:Severity of Illness Index; D014006:Tinea Capitis / Q000175:diagnosis / Q000453:epidemiology