I was having that problem but on my downstairs area and thighs, I got tested for everything and they didn't find anything.. So I think it's just a reaction to my laundry detergent or my panty liners.. :/
hmmm, I wonder? the bumps seem to be where ever I have stretch marks, on my belly, my inner thighs, under my arms, on my hips. =\ Yeah I got stretch marks everywhere.
I don't know if mine are sweat rash.. I pretty much stay cool in doors. ill have to show my doctor. because the lil bumps are everywhere. and itch like crazy.