Interferential current has shown promising results for treating psoriasis with a good tolerance. Prospective randomized studies versus placebo are required to confirm the interest of such an approach.~Main objective To assess the efficacy of interferential current for treating palmoplantar psoriasis.~Secondary objectives To assess the subjective efficacy by the patients, the efficacy on the nails, to study the potential side effects.~Patients Patients from 18 to 90 year-old with psoriasis on the hands and/or feet. Length of the study: 12 months Methods Monocentric randomized comparative study versus placebo.Intervention V0 : Selection: Information of the patient, control of inclusion and non inclusion criteria.~V1 : Control of inclusion and non inclusion criteria (treatment against psoriasis have to be discontinued for at least 3 weeks and 3 months for anti-IL12/23). Clinical scores and photographs. Explanation of the functioning of the device, then the treatment is followed at home, twice a day 5 minutes. 10% salicylic acid ointment will be applied after each session.~V2 : End of the treatment (12 weeks after V1). Clinical scores and photographs. V3 : End of the follow-up (24 weeks after V1). Clinical scores and photographs.
Interferential current has shown promising results for treating psoriasis with a good tolerance. Prospective randomized studies versus placebo are required to confirm the interest of such an approach.~The Main objective is to assess the efficacy of interferential current for treating palmoplantar psoriasis.~Secondary objectives is to assess the subjective efficacy by the patients, the efficacy on the nails, to study the potential side effects.