Study of the Characteristics of Pruritus in Patients With Frontal Fibrosing Alopecia or Lichen Planus Pilaris

Inclusion Criteria: * Major patient. * Fibrosing frontal alopecia or lichen planus pilaris * Presence of pruritus of the scalp : a positive response to the question "do you experience itchy scalp?" * The patient received an information note and did not object to the study Exclusion Criteria: * Patients under 18 years of age. * Other pathologies causing scalp pruritus (seborrheic dermatitis, contact dermatitis, lupus, Quinquaud's decalcifying folliculitis, ectoparasitosis, scalp psoriasis, ringworm, red sclap syndrome, dermatomyositis, central centrifugal cicatricial alopecia (CCCA)) * Refusal to participate by the patient. * Patient under legal protection (curatorship, guardianship, ...) * Patient not covered by social security