Hello, I am on vacation in the USA. Since yesterday, all over my shoulders and neck, I have had heat spots, similar to small water bells. What should I do to treat them?

Hello. It is very difficult for me to answer you precisely without seeing the pimples on your skin. I would recommend that you show the reaction on your skin to a pharmacist in the United States to get their opinion. In the meantime, I would recommend that you cover your skin as much as possible when you are exposed to the sun (wear long clothes and a hat if possible). Also, you can apply an unscented moisturizer (e.g. Aveeno) to your skin where you have pimples. If you have itching, you can also take 1 cetirizine 10 mg tablet once a day to relieve the itching