Discontinuation of the study was justified by the inclusion of 21/100 patients, which finally enabled a relevant analysis to be made in view of the homogeneity of the results.

The prevalence of pruritus has been studied in frontal fibrosis alopecia (FFA) and lichen planus pilaris (LPP), but there are no studies evaluating the characteristics of pruritus, the correlation between pruritus and disease activity, and its impact on quality of life.

The knowledge of the characteristics of pruritus, of the link "disease activity - pruritus", and its impact on the quality of life could allow us to modify the management of the patient (modification or intensification of therapy, close monitoring...)

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

Major patients with frontal fibrosing alopecia or lichen planus pilaris, with scalp pruritus, followed in the Dermatology Department of the CHRU Brest and having given their consent to participate in the study.

All collected data that underlie results in a publication

Data will be available beginning three years and ending fifteen years following the final study report completion

Data access requests will be reviewed by the internal committee of Brest UH. Requestors will be required to sign and complete a data access agreement.