It sounds like it is getting infected a little bit. Just keep cleaning it. This happened when I got my belly button pierced.
That only means it's healing. I've had my lip pierced, tongue pierced, nose pierced, ears etc. And they all come out like that... it's sort of a scar type thing, as for looking like a pimple, it may be starting to infect itself but sometimes leaving it in may take it's course and heal itself in a round about way. It'll turn out.Nipple piercings on small breasts?