Polytar Soap manufactured by Stiefel labs is an example of soap used for psoriasis. Contains a unique blend of Solubilised Crude Coal Tar and Coal Tar Solution, specially formulated to control and relieve the skin itching, irritation, redness, flaking and scaling associated with psoriasis and seborrhoeic dermatitis. Use on affected areas in place of regular soap. Work up lather using warm water and massage soap briskly onto skin. Rinse well and repeat.