For five years now I am unable to sunbathe, I get a red rash and sometimes very small bubbles mostly on my belly and the inside of my arms and upper legs. It gets really itchy, especially at night and water doesn't help calm it, although cortisone creams do but i'd rather not use them, but in any case it goes away after a few days. Throughout my life I had always great resistance to the sun as I have olive skin and dark features. Sunscreen, even suncblock or vitamin d boosts have not helped, could you please tell me how to fight it? I also heard that creams and some medicine (i take mefenamic acid for pain relief) may be the cause of it, what can i do?