I break out after exercising. Should I exercise less?

I would look at makeup, friction, and what happens after sweating rather than assume exercise is the problem. I would also look at tight hats, masks, hair products, and how long sweat stays on the skin before changing a healthy habit like exercise.

Look at sweat, friction, and what happens afterward

Pat sweat with a clean towel instead of rubbing, and cleanse gently afterward. Repeated scrubbing or several harsh washes can add irritation.