I'm going through the exact same pain right now, so I asked my Mom (who is a nurse) and she said that it was a heat rash. A heat rash is a very common issue amongst tanners. It's known to cause red/pink rash, little white bumps and itching that can sometimes be severe. The best way to get rid of it is use a really good
moisturizer , I use pure Cocoa Butter, and only tan every other day or every other 2 days.