photosensitivity disease hereditary photodermatosis inherited porphyria phototoxic porphyria https://github.com/monarch-initiative/mondo/issues/10650 MONDO:0700516 An inherited porphyria characterized by chronic blistering or non-blistering cutaneous manifestations, including photosensitivity, fragile skin, blistering, scarring, hyperpigmentation, hypertrichosis, and alopecia. These symptoms arise from the accumulation of photoreactive porphyrin precursors in circulating erythrocytes, which triggers phototoxicity primarily by damaging endothelial cells in the skin upon light exposure. phototoxic porphyria