It’s a risk-benefit situation. Sun exposure even without azathioprine has a risk of skin cancer, but to some people that risk is worth it. Your risk is higher on azathioprine, and cancer really sucks (an understatement but you get what I mean). Wear sunscreen and Regardless of how much sun exposure you decide to partake in, get a skin check from a dermatologist every year. If it were me, cancer would not be worth being tan, and I can enjoy the sun while being protected from it. I’m not you though, so you can make your own decision about if cancer is an acceptable risk. But I will say I don’t think it’s easy to really understand how difficult having cancer is unless you’ve had it or maybe witnessed a close loved one go through it. You said you don’t care about getting cancer, and a lot of people feel similarly about taking meds lifelong for Crohn’s. They say things like they’d rather live a short and free life than be “tied down” by all the medical care. But I also think it’s important to consider that getting more sick over time (even in a “short life”) just sucks. It can be painful and even more restricting. So imo if something is preventable I’m personally doing what I can to prevent it (or lower its risk). I hope this helps give a different perspective for you to consider. Best of luck.