Medically reviewed by Brendan Camp, MD Polymorphic light eruption (PMLE), commonly known as a sun rash or sun poisoning, is a ...

A 17-year-old white male with Crohn's disease who was receiving maintenance infusions of the anti-tumor necrosis factor (TNF) agent, infliximab, presented with a new-onset psoriasiform skin rash.

The rash, sometimes mistaken for heat rash ... “although it is more common in paler women”. A person with sun sensitivity can react to both types of ultraviolet light that reach the earth.