There are other forms of psoriasis. Each form can exhibit mild, moderate or severe symptoms. Treatment is usually geared to the severity of the condition. Topical steroids are generally used to treat mild psoriasis. It is the prolonged use of these steroids that causes thinning of the skin, making the individual prone to purpura, which is bleeding and bruising under the skin caused by the slightest trauma to the skin.
Systemic steroids are at times taken orally, or injected intramuscularly.
At times the steroids are injected into the psoriatic site itself. Coal tar has been an age-old remedy and is used in soaps, shampoos and in combination with other medications. Coal tar is also used in a bath as a soak for the entire body.