how long have you had them?
what do they look like?
can you attach a picture?
what other medical problems do you have?
are they in one spot on your stomach? or scattered all over?
do you have the rash anywhere else?
are there blisters? crusting?
Sometimes the stomach is a common place for a shingles (herpes zoster) infection, but these start as blisters and are painful in a more straight line pattern.
It is most likely folliculitis - an inflammation and infection of the hair follicles on your stomach. Your doctor can prescribe a short course of antibiotics to help it resolve and you may want to use antimicrobial soaps.
Your doctor can also rule out scabies - an infection of a skin mite that can be very itchy.
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You have hair follicles on your stomach even though it doesn't look hairy.
It could also simply be a contact dermatitis from something that you wear or use. You can switch to all dye and perfume free soaps and detergents and try a hydrocortisone 1% cream on the rash to see if it works.