u/Any-Firefighter-2820

So a few days ago my gum guard did some damage to my gum. I thought nothing really of it and I have been careful brushing around the area. It has been painless. Today I tasted something foul and I looked at it and there was a small dark dot and it leaked a little blood, and some yellowish stuff. Any idea of what it is and can I treat this at home or is this serious. Thank you in advance. I vape and i drink only once per month