OTC topicals are available in pharmacies, Coal Moisturizer drugstores, supermarkets or directly from the manufacturer without a doctor's prescription. They come in many different forms. Two active ingredients, salicylic acid and tar, are approved by the FDA as treatments for psoriasis.Salicylic acid is classified as a keratolytic, or peeling agent, and works by causing the outer layer of skin to shed. It is a common and effective treatment for a wide variety of skin problems. As a psoriasis treatment, it acts as a scale lifter, helping to soften and remove psoriasis scales.Strong salicylic acid preparations can cause irritation if left in contact with the skin for too long. The body may absorb too much salicylic acid if used over large areas of the skin. Salicylic acid may also weaken hair shafts and make them more likely to break, leading to temporary hair loss.Tar derived from both coal and wood (e.g., juniper, pine) are both used for medicinal purposes. However, coal tar is the type used most commonly to treat psoriasis. Tar can help slow the rapid growth of skin cells and restore the skin's appearance. In addition, it can help reduce the inflammation, itching and scaling of psoriasis. Tar products can vary dramatically from brand to brand. Generally, the higher the concentration of tar, the more potent the product.Tar can irritate, redden and dry the skin. Test a tar product on a small area of the skin first. If reddening occurs, try applying the tar on top of a moisturizer. http://www.alvenaandduaderma.com/coal-moisturizer-reviews/