According to https://medlineplus.gov/ency/article/000030.htm
"There are three levels of burns:
First-degree burns affect only the outer layer of the skin. They cause pain, redness, and swelling.
Second-degree burns affect both the outer and underlying layer of skin. They cause pain, redness, swelling, and blistering. They are also called partial thickness burns.
Third-degree burns affect the deep layers of skin. They are also called full thickness burns. They cause white or blackened, burned skin. The skin may be numb."
Our patient has only redness and pain over her skin, but no blisters--therefore, she must have first-degree burns (b/c blistering begins in second-degree burns).
FYI: Rhus dermatitis is urushiol-induced contact dermatitis--i.e. poison ivy, poison oak, poison sumac. I'd never heard it called that!
Sun allergy can be used to describe a number of itchy, red skin conditions that develop after sun exposure. But, it most commonly refers to sun poisoning, which presents with itchy, tiny bumps--> this is not a finding in our patient. https://www.mayoclinic.org/diseases-conditions/sun-allergy/symptoms-causes/syc-20378077