I Had What Looked Like A White Head Pimple On

I had what looked like a white head pimple on my penis shaft close to the hair line.
It does not hurt at all and has gone down in size to about the size of a small dot
My mother says it is most likely a in grown hair
I had sex with a condom about four weeks before it showed up
I also work in a area that is warm and do swear a lot in that area