• Goeckerman therapy: Some doctors combine coal tar treatment with light therapy, which is known as Goeckerman therapy. The two therapies together are more effective than either alone because coal tar makes skin more receptive to UVB light.
• Anthralin: Anthralin (another tar product) is a cream used to slow skin cell growth. It can also remove scales and make skin smoother. It should not be used on the face or genitals.
• Light therapy: Light therapy is a first-line treatment for moderate to severe psoriasis, either alone or in combination with medications. It involves exposing the skin to controlled amounts of natural or artificial light.
• Sunlight: Brief, daily exposures to sunlight (heliotherapy) might improve psoriasis. Before beginning a sunlight regimen, ask your doctor about the safest way to use natural light for psoriasis treatment.
• UVB broadband. Controlled doses of UVB broadband light from an artificial light source can treat single patches, widespread psoriasis and psoriasis that doesn't improve with topical treatments.
• UVB narrowband. UVB narrowband light therapy might be more effective than UVB broadband treatment and in many places has replaced broadband therapy.
• Psoralen plus ultraviolet A (PUVA). This treatment involves taking a light-sensitizing medication (psoralen) before exposure to UVA light. UVA light penetrates deeper into the skin than does UVB light and psoralen makes the skin more responsive to UVA exposure.
Courtesy: Mayo Clinic