A 21-year-old Female presents to her PCP for evaluation of an itchy, bumpy rash that comes and goes

A 21-year-old Female presents to her PCP for evaluation of an itchy, bumpy rash that comes and goes but resolves within a few hours. This has been going on for 1 month. The last episode of rash was 1 day ago and lasted all day, keeping patient up at night. The rash was accompanied by a swelling of the patient’s eyelids. The patient took diphenhydramine at night, which helped a little. Today, the eye swelling has resolved, and the rash is slightly better. The patient was able to take some pictures of the initial rash with her phone. The rash in the pictures shows raised bumps and patches, round or oval across the body, especially on the abdomen, thigh, and back. The patient remembers having a few itchy bumps here and there in the past but thought they were mosquito bites. The patient cannot recall a correlation between rash and possible triggers such as food, contact, or other stressors such as heat, cold, or medications such as NSAIDs. The patient is extremely concerned as she has tried to find answers online and worried she may have a cancer or leukemia. The patient is unsure of any food allergies.