I have sunburn spots (around one inch on each arm) on both of my arms. I get strong itching sensation quite frequently now. Especially when I get any sun exposure, even with sun screen on. The spots are very dry and sometimes become red. The texture of those spots is also different from the rest of the skin. I have regularly used aloe vera gel on these but it's not helping. I have tried calamine lotion too. What should I do?