Breakouts (zits) on belly, no where else

Trying to figure out if it is some sort of allergy, or food issue, or if it is related to surgery. Had my first red area show up on one of my surgery scars (about 6 months post op now). Then over the past few days, more and more zit areas pop up around on my belly. Another on one of the scars. I shower at least once a day - twice a day if we go swimming at the pool. I can't figure out what is causing the irritation. Thought maybe mangos recently, so cut those out. If it was sugar or greasy foods, my face would break out - and i really don't eat much of either of those - especially not greasy. When the spots first show up they itch, then they go away after a few days. They do not spread - so not like poison ivy or anything. Doesn't seem like bug bites - we have no pets or fleas that we can tell. Bug bites would normally be in other areas too.