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.