autophytophotodermatisis

Phytophotodermatitis is when a human ends up with irritated, inflamed skin upon certain plant compounds, and then ultraviolet light (usually from the sun). This can cause blisters, reddening, edema, and other unpleasant symptoms. Both the plant (phyto) and ultraviolet light (photo) component must be present; it is not like a poison oak or spicy food reaction. It is also not an allergy. More info here.

Autophytophotodermatisis is a condition where a cachaemites undergoes phytophotodermatitis due to their own secretions. While the secretions are technically created by the infected and therefore not strictly from a plant, the genes involved in the process are lifted directly from plants known to cause phytophotodermatitis, in the same way that if you give a bacterium the gene to make human insulin, the insulin it makes technically didn't come from a human, but we still call it human insulin because it's chemically identical to the stuff a human who doesn't have diabetes can make. The reason why autophytophotodermatitis happens is that the fuccomarins produced by cachaemites are the same ones that can cause phytophotodermatitis. As most cachaemites have no conscious control over their secretion of these chemicals, most cachaemites are sun-sensitive.