I Had This Red Bump ( Pea Size ) On

I had this Red Bump ( pea size ) on my bikini line
( for three days) .
When pressed down on it hurt but really didn't bug me .
The area around it was a little Red going down my bikini line.
I put a hot Towel on it for the past two days , I went down to surface has White ring around it.
Any idea of what it could be.