Discovered a weird bump?

I just got std screenings like 6 months ago. I got tested for everything and I only have one partner and it was the same one I had 6 months ago. I currently have a wicked yeast infection and when I last went, I got checked for only the yeast infection.

My SIL told me that yeast infections can sometimes cause skin tags and I want to know if anyone has experienced that?

It’s like between my buttcheeks, I can’t see it that well so I can’t tell if it’s an ingrown hair? But when I touch it, it feels soft?

I know it’s not anything serious since i just got checked less than a year ago, and theres been no signs of him cheating but still I’m scared about this, like what if I had false negative? What IF it is something?

Should I go get checked again?