Methoxsalen is a furanocoumarin and an active compound of a traditional Egyptian medicinal plant Ammi majus L, whose juice/fruit has been used for many years in folk phototherapy for the treatment of vitiligo or a hyperproliferative skin disorder, psoriasis. It is a potent suicide inhibitor of CYP (cytochrome P-450), is an agent used to treat psoriasis, eczema, vitiligo and some cutaneous Lymphomas in conjunction with exposing the skin to sunlight.