
No, I have never heard of this problem - it's unusual. Aerobic exercise usually improves the complexion because sweating opens up the pores. Most likely, an irritant that is touching your face produces the rash. Think about the detergents and fabric softeners used for your towels and clothing; consider if a soap or lotion might be affecting your skin. If this isn't the problem, discuss the situation with a dermatologist - he or she might have other suggestions.