After two years dealing with this problem I finally got my diagnosed, and I have Hidradenitis Suppurativa, it is usually misdiagnosed, so maybe tell to your Dr, this can be the cause
Use iodine it works trust me I used to suffer from it. Iodine works miracles
that is not how pimples work hahahaha
10% benzoyl peroxide put thick coat on twice a day and stick with it they’ll clear right up.
Peroxide for the stain