Psoralen is used along with ultraviolet-A irradiation where it works by decreasing the number of cells the skin makes.
Redness of skin, Blisters on skin, Edema, Itching
Psoralen is used in the treatment of vitiligo and psoriasis.
Psoralen and ultraviolet A radiation (PUVA therapy) is used to treat certain skin conditions like psoriasis, eczema, polymorphic light eruption, and mycosis fungoides.