Pimple near chest

Dear mummies. Please help if any of you ever experience this. I have this kind of pimple on my chest, aerola & below my breast. Experience this during confinement. Not sure if this is because the SG weather is very hot as my house don’t have aircon and i very very often sweat so much. I haven’t finish my confinement & plan to go see doctor after that. Meanwhile any advice you can give? Thank you!