Allergic contact dermatitis occurs when ... getting it on more exposed parts of your body. You can get heat rash under your arms for a lot of the same reasons that you can get infections and ...

An allergic reaction, or when your immune system overreacts to a harmless substance, can sometimes manifest in the form of a rash. An allergy rash can be uncomfortable and lead to infections ...

If you have a red rash on your hands, arms, or legs that's accompanied by ... a plant that causes an allergic reaction in up to 75 percent of people who come into contact with it.