PUVA is a phototherapy that uses a type of medication called Psoralen (P) in combination with exposure to Ultraviolet A (UVA). Psoralens are compounds that are naturally found in many plants. Psoralens have the unique ability to make skin more sensitive to ultraviolet light. In fact, ancient Egyptians used psoralens for treating skin diseases thousands of years ago.
PUVA is a powerful treatment, not without some possible side effects. However, for treatment of advanced cases of psoriasis, eczema and morphea, PUVA can produce results that other therapies simply cannot.