“Polymorphous light eruption is a rash caused by sun exposure in people who are sensitive to sunlight. Polymorphous means that the rash can have many forms, such as tiny bumps, raised areas or blisters. The condition also is called sun allergy, sun poisoning and polymorphic light eruption.

Polymorphous light eruption is a rash that affects parts of the body that are exposed to more sunlight as daylight hours get longer, such as the front of the neck and chest. Polymorphous means that the rash can have many forms, such as tiny bumps, raised areas or blisters.”

MAYO CLINIC (https://www.mayoclinic.org/diseases-conditions/polymorphous-light-eruption/symptoms-causes/syc-20355868)