So about a month ago i plucked an ingrown armpit hair and since if done that from where i plucked it its left this huge red bump in its place, help?

This Is The Pits: Two possibilities:1) the hair growing back went off-course and became an ingrown hair or, 2)somehow that little spot got infected. It's often hard to figure out --and sometimes that ingrown hair can get infected. Don't squeeze it or try to pop it.If it gets bigger or hurts more or won't go away, get it seen by a doctor. In the meantime, try not to irritate it, if possible.If not, just get it seen