When I am exposed to the sun (with and without sunscreen) I develop breakouts on my back and shoulders. It looks like small pimples all over. They tend to disappear after a few weeks of non exposure to the sun. Could this be a heat rash...and is it preventable?
What you describe seems like sweat dermatitis or heat rash.
You should try to keep the area dry and clean. Try some powder to absorb the sweat. Use a medicated sunscreen lotion - preferably one prescribed by your skin specialist.
Apply calamine lotion at the sites to help soothe the lesions.
If the symptoms are still persistent, consult your dermatologist and get a proper clinical evaluation done.
Let us know if you have any doubts and keep us posted on how you are doing.
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