Could yours be an alergy to the sun lotion??
I have the same thing happening. It looks just like the picture in the 1st post.
EXCEPT, I do not wear biking shorts.
The first two times it happened I had street pants on (I'm not a serious cyclist) and then the 3rd time, I wore jean shorts.
There was NO material whatsoever in contact with the skin area that developed the rash.
After a 27 mile ride, there it was. I'd have to eliminate the chafing or allergen possibilities. What about vitamin deficiency?
I'd like to know more about the contact dermititis too. Does there have to be direct contact to the area?
I'm in FL, 90 degree weather.
I have the same problem, mostly on the inner thighs. It has become more noticeable since I started riding with new Sugoi bib shorts with the silicone band.
One other thing I now realize, I use to ride wearing a nike swimsuit shorts under my bike pants (both the Pearl Izumis and the Sugois) and never had the rash then. It has become moderate since I started riding "commando". :-)
I'm going to try riding with my nike swimsuit or compression shorts under again and report any changes.
Same thing happens to me and my Pearl Izumi's . I wonder if it has to do w the silicone 7 sunscreen combo? i put sunscreen on then my shorts, about mile 40 I noticed the rash appear. It appeared where the gripper is and then down the thigh to my knee. Next week I hope I can remember to put on shorts, apply sunscreen and roll up the leg gripper...
I am pretty new to cycling, but my last two rides of 50 miles and 60 miles I have come home with this same rash and it is so irritating. You can't ride again for a few days because it looks so dang bad. I visit my doctor in a few days who is a cyclist so I definatly be asking her opinion and I hope she has an answer. If she does I will be sure to share it with you all!