Psoriderm Cream Psoriderm Cream is designed to help treat sub-acute or chronic plaque psoriasis. This type of psoriasis involves areas of raised, red, sometimes itchy, patches of skin, covered with silvery scales (without any blistering or tenderness) & often occurs on the elbows, knees, lower back & scalp. Psoriderm Cream contains distilled coal tar which stops itching & restores normal skin development & lecithin which softens the skin, helping to increase the action of the distilled coal tar. Psoriderm Cream can be used by adults, the elderly & children.