I have significantly increased my number of miles this summer and it has been going great! Except I've experienced some debilitating chaffing. I rode 45 miles last Thursday and when I was finished my backside was totally swollen. When the swelling went down, it looked like I had rug burns. The chaffing occurs along the seam of my bike shorts. In particular where I contact the saddle. I currently wear the same shorts I've worn for the past 4 summers of riding (I only ride in summer) and I've never had this problem. I thought that maybe my shorts were worn out so I bought another pair (same ones I have now--PI Attack Short). However, I'm very worried that this won't solve the problem since all the seams are in relatively the same location, regardless of short.

Please help, I'm at a loss for what to do and it is so sad! Thank you in advance!