If your feeling burning or stinging on the body take some pictures because depending on how often and how many times this happens it will eventually cause a freckle or mole like mark. You will start to notice this happening in the same place quite often. It will help to have some good before and after pictures.
If you only feel stinging on the body once or twice a day consider yourself lucky because it can be much worse. Some people report this going on for years at a time well over a hundred times in a day. This might be the best way for you to support your argument.