Algorithm for distinguishing non-blistering cutaneous porphyrias

This algorithm outlines an approach to the patient with suspected cutaneous porphyria and non-blistering photosentivity. Separate algorithms are available for the patient with suspected cutanous porphyria with blistering photosentitivity, and the patient with suspected acute (neurovisceral) porphyria. Refer to UpToDate topics on individual porphyrias for further discussions of the clinical manifestations and diagnostic evaluation. Refer to content on photosensitivity disorders for other diagnostic considerations.