[header] How to treat skin rash [title] Examine the spread and location of the rash. [step] Rashes can start for a variety of reasons, but most of them are easily treatable. The treatment of a particular rash will depend on the cause. 
First look at the way the rash is distributed. Where is it? When does it show up? [substeps] If the rash is generalized all over your body (has spread everywhere), it's more likely to be an allergy to something you've eaten, either a medication or food.