I have been on 100 mg of Azathioprine for the last two years, with Pentasa and Cipro, which put me in remission. I forgot all about the photosensitivity, and went out working in my garden all day without sunblock. I now look like a lobster. The sunburn from hell. Even the part in my hair got sunburned. I hope it does not blister and peel. The thought of getting skin cancer is scary. So a word of warning to you all, don't do what I did. Cover up and use sunblock. I think I am going to have a very painful night.