Hi there
How is your boyfriend doing now? The bumps could be anything from acne to a cyst to some sort of infection. Sun poisoning usually has other flu-like symptoms such as fever, chills, nausea, and dehydration.
Please know that I am not a doctor or dermatologist. In this case it would be wise to seek guidance from a doctor. I would not put anything on it until you know what you are dealing with but do keep the skin area clean.
Let us know how he is doing. I hope he feels better by now. Thank you for your question.
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