Can you be allergic to your underwear?

"Ok believe it or not this is a serious question,for a while now I have been very suspicious that I am allergic to my underwear.I will explain: Basically I kept experincing painful rashes after using my 90%cotton 10%lycra stretchy underwear.I had painful rashes on my private area including my bottom and wherever the elastic touched my skin including the leg creases.So I switched to 100%cotton underwear but of course they still have some elastic.It reduced the soreness and itching in the private area but still I was experiencing irritating rashes in the leg crease.so I started to go commando and the problem cleared up.However its not possible to go commando all the time so,yesterday i grabbed some underwear not realizing it was the stretchy kind and now I have a sore,painful and rashy private area.The same thing happens with my bras,i break out under my arms and on the sides where the bra touches my skin.does anyone know what I should do about this? is this an allergy??"

Source: http://www.healthexpertadvice.org/forum/Allergies/Can-you-be-allergic-to-your-underwear-27075.htm