Red, small and itchy spots have appeared on my back and chest from the sun, how do I get rid of this?

As above . Every thing under the sun even the sun it self may cause allergy, u can try Hydrocortisone cream and if no improvement , try to see u pcp.
Difficult. If you are not on any photo(light)sensitizing medications, then best answer is sunscreen. Now that they are present, will be a couple of days for them to reabsorb.

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