Glytone by Ducray KERTYOL P.S.O. Scaly Scalp Shampoo (PSO = Patches, scales, opaque) helps eliminate scales and calms redness and itching. With its gentle cleansing base, it is well-tolerated and pleasant to use even on the most fragile scalps. KERTYOL P.S.O. Scaly Scalp Shampoo may be used alone or in association with specific dermatological treatments related to dry scalp. KERTYOL P.S.O. Scaly Scalp Shampoo is specifically formulated with a proprietary blend of ingredients, including Ichthyol®, to calm and soothe the scaly, irritated scalp. Scaly conditions on the scalp are often associated with excessively rapid epidermal cell renewal. These cells accumulate on the skin’s surface creating scale and opaque patches that often cause redness and itching. Ease discomfort and re-balance scalp with KERTYOL P.S.O. Scaly Scalp Shampoo.