<prompt> Psoralane Ultra Violet A PUVA therapy is advised inPemphigus vulgarisApthous ulcersCarcinoma in situANUG  <response>: According to Rook and Colleagues the extra corporeal photochernotherapy for drug resistant pemphigus vulgaris include administration of 8-methoxypsoralen followed by exposure of peripheral blood to ultraviolet radiation. It is also used for vitiligo and graft versus host disease. 