A method for testing diseased skin for treatment of the diseased skin, comprising the steps of administering a plurality of increasing doses of phototherapy directly to regions of an area of diseased skin and analyzing the area of the diseased skin to assess the doses at which burning and blistering of the diseased skin occurs, determining a maximum dose of phototherapy that can be administered to the diseased skin based on the assessment of the doses at which the burning and the blistering of the diseased skin occurs, and treating the diseased skin.
