Psoriasin Gel is a topical medication for treating the itching, scaling, and flaking skin that can occur with psoriasis and seborrheic dermatitis. The active ingredient is Psoriasin Gel is Coal Tar, a keratoplastic drug that causes skin to shed the dead cells from the top layer of the affected skin areas and slows down skin cell growth. By slowing the skin cell cycle, new skin cells will not surface and build up under the scaling layer that has yet to slough off. Your skin may be more sensitive to sunlight after treatment so wear appropriate clothing and sunscreen to avoid burning.