Parallel Group Trial to Evaluate the Efficacy and Safety of Loion® Compared to 10% Salicylic Acid in Patients With Chronic Psoriasis Capitis

Inclusion Criteria: * Patients ≥ 18 years of age * Having a diagnosis of chronic psoriasis capitis (scalp psoriasis) with or without the involvement of other body areas and with or without psoriatic arthritis. * PSSI ≥5 (range 0-72) * Scaling ≥2 (on an scale from 0 to 4) * At least 10% of scalp area affected * If a women: * Postmenopausal * Premenopausal and using an established oral, injected or implanted hormonal method of contraception, intrauterine device (IUD) or intrauterine system (IUS) * Negative pregnancy test at inclusion * Patients with no concomitant systemic psoriasis medication. * Willingness and adherence to the prohibitions and restrictions specified in the study protocol. * Willingness to self-administer the drug. * Signed informed consent document indicating that the patient to be included understands the purpose of and the procedures for the study and is willing to participate. Exclusion Criteria: * Patients having a solely non- plaque form of psoriasis (e.g. erythrodermic, guttate, pustular). * Patients with uncontrolled psoriasis under the current treatment. * Patients having received topical keratolytic agents for the scalp within the past 2 weeks and topical steroids for the scalp within the past week (prior to inclusion). * Patients receiving systemic antipsoriatic drugs, immunosuppressants or systemic corticosteroids (within 4 weeks prior to inclusion). * Women who are pregnant or breastfeeding or planning to become pregnant during the observational period. * Patients participating in another study using an investigational agent or procedure during participation in the study observation period. * Known hypersensitivity to any ingredient in the investigational products' formulations. * Having any condition that in the opinion of the investigator makes the participation not be in the best interest of the subject. * Employees and staff of the investigator or study site with direct involvement in the study as well as family members of the employee or the investigator.