when going in the sun anytime of the day and being exposed for more than 15 minutes to areas of my skin that is not covered by clothing, i develop a red rash in that area that itches like crazy. The rash is very inflammed and i have to apply coconut oil or aloe vera to cool it down. What is causing this? I've been dealing with this for the past couple of years on and off. I do take multi-vitamins and revestrol on a regular basis?