are these new shorts for you? and do you have any allergy? I had the same type of reaction to my first pair of PI shorts, t'would seem I'm allergic to the antibacterial ingrediant they use or the synthetic chamois. I stopped wearing them as soon as I had problems, got myself healed up and haven't had any problems since..........but I'll never wear PIs again.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"