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Potential Sun Allergy

After moving from Australia to America, I had notice that my arms would get small bumps on them within a few hours of sun exposure that lasted anywhere from 10-20 minutes depending on how intense the sun was on the day. These bumps are skin coloured, smaller in size than a dot made by a pen and would itch for a short period upon erupting on my skin but the bumps themselves wont resolve until weeks later. I find it unusual as I was born, and grew up in, Australia and have a Middle Eastern/Mediterranean heritage and have never had this issue until the age of 24. I find that using suncream before sun exposure prevents the reaction, along with avoiding the sun in general but was wondering if anyone knew what this could be exactly and if there's a way to fix it.
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5536886 tn?1455827346
COMMUNITY LEADER
The best way to prevent a rash like this is to wear the sunscreen and limit your exposure to the sun.  Another thing you can do is try to pinpoint the cause- sometimes medications, exposure to certain chemicals or fragrances, and a few other things can cause this reaction.  You should be able to head to a doctor to try to get more leads on the cause and see if you can clear it up that way.  
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Unfortunately it's only sun exposure, I'm not on any medications and don't use any unusual fragrances that differ from what I've been using my whole life. Unfortunately, I would have to see a specialist but as an international graduate student, I don't have the funds to afford such luxuries :(
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