Out-patient treatment of psoriasis: short contact and overnight dithranol therapy compared.

Short contact (30 min) and overnight therapy with 1%, 2% and 3% dithranol in an ointment base were compared in 30 out-patients with plaque psoriasis. Both regimes produced significant clearing, there being no statistically significant difference between the two. There were three withdrawals from each group. The remaining 12 patients on the 30 min regime found it both effective and practical. It is therefore a useful alternative regime for out-patient dithranol therapy.