It's much more likely to be the oxycodone (opiate) than the Advil which I've never known to cause allergic reactions. Opiates do, however but not to that degree. But dermatology is outside my sphere of experience so I can't offer any more insight. But I do hope you find some answers.The rash/sores has spread. It is on my knee(surgical), stomach, chest, back, hips and neck. They are not bumps or hives but sores that scab over and doesn't seem to heal.
As well as prescribing Amoxicillin for you , did the dermatologist prescribe anything for putting on the rash?I made an appointment with another dermatologist and was seen today. She diagnosed it as psoriasis which is what I thought I may have.

United States
United States