Psoriderm Cream is an intensive treatment for areas of your skin and scalp affected by sub-acute psoriasis or chronic plaque psoriasis. This type of psoriasis causes areas of raised, red, sometimes itchy patches of skin covered with silvery scales on the elbows, knees, lower back, and scalp. This cream is recommended for use by adults, the elderly, and children and contains the active ingredient distilled coal tar, which stops itching and restores normal skin development.