Patients with severe or disabling psoriasis may go to hospital or psoriasis treatment centres for concentrated treatment with UVB and topical coal tar. This is known as the Goeckerman regimen and usually takes at least three or four weeks of daily treatment.
Psoriasis is a dry, scaly skin condition in which cells are produced too quickly. Normally skin cells take about 21 to 28 days to replace themselves, in psoriasis they take around 2 to 6 days