Hard bump under my eyebrow piercing??

i got my eyebrow pierced 6 months ago, it’s been giving me minor problems but nothing major. about a week or two ago my boyfriends ring or something got caught on the bottom ball of my eyebrow piercing. a few minutes after the underneath of my piercing was a dark purple. i thought it was getting better, but fast forward to now there’s a hard red bump that’s been there for a couple of days. what is it and what should i do?? :(