NOTE: Kahn included the observation of the worsening of scarring in smallpox patients under his section on porphyrins (12) noting that both smallpox patients and people that have been cutaneously injected with hematoporphyrin exhibit photosensitivity.
Caption and illustration from Volume II of German physician Fritz Kahn’s Der Mensch gesund und krank, Menschenkunde, published in 1939.
Courtesy of the National Library of Medicine