If you have a rash along with fever, fatigue, headache, muscle pains, upset stomach, vomiting, and belly pain, you might have a “hypersensitivity reaction,” which can happen with several HIV ...

All hives are a rash, but not all rashes are hives. Hives on the stomach can occur for a variety of reasons. Sometimes, the cause of the hives is unknown. Possible causes include: Stomach hives ...