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What symptoms are you having? When did they begin? How old are you?
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This is Dr. David
can you upload a clear jpg photo of these small bumps?
are they itchy or painful?
you need to see a GI doctor to get some testing for the diarrhea symptoms you are having
you could be allergic to gluten or milk lactose or something else could be going on.
if you are having a lot of diarrhea and wiping, you could be irritating the skin there and causing them
they could just be irritated hair follicles.
could be blocked skin pores there from excessive moisture or sweating.