I guess this is a quasi-medical question…I have bumps on my upper arms and shoulders, tiny ones that are practically invisible, but I can feel them quite distinctly. The area they cover is where I wear my t-shirts, which I wear everyday. Does anyone have the same thing on their arms? Is this caused by a certain brand of laundry detergent? I just get the cheap stuff, I’ve never really noticed other kinds.
Now that I’ve grossed everyone out, you can finish your breakfast.
IANAD…
… but, keratosis pilaris.
www.keratosispilaris.org
Ugh that’s what I have and it sssuuuuxxxxx. Nothing you can do about it (so says my dermatologist) 
It could be your laundry detergent, or your body soap. Try using baby shampoo or baby bath to bathe with, and see if that helps. I used to get bumps simlar to what you’re describing, and changing body soap was the first thing my dr. suggested.
(it worked, and the generic baby bath/shampoo are only a buck a bottle)
If it happened after you switched detergents, that’s a hot clue. I’m scared to switch brands. Last time I did, Mrs. Nott woke up with her eyes swollen shut.
Someone told me that they had those bumps, and when they stopped eating wheat products, the bumps went away.
Hey, I think I have that, and I never knew what it was!
I love this board!
Try washing the Tshirts without detergent (and you’ll be amazed at how many suds there are) and then wearing them. If they don’t bother you, it’s the detergent. You may simply be using too much to rinse out.
I had this really bad rash on my back for several days and I couldn’t figure out what it was. It turned out to be one of those anti-static spray things. I would spray my shirts in the morning if they were really wrinkled. Are you using any of those?
Dryer sheets can give me a giant rash, so watch out for those, too.