Psoriasis: treatment with a tar gel.

Crude coal tar has long been an effective and safe form of therapy for psoriasis. However, as compounded in an ointment base it has many objectional features and usually is limited to hospital use. A new tar gel has been studied which appears to equal the effectiveness of crude coal tar, is convenient to apply, and is cosmetically acceptable. This new tar preparation is a valuable addition to the therapy of psoriasis.