what is this?? tmi pics

background: went to the dr for a yeast infection anout 2 weeks ago was tested for stds and was all clear. (also pretty sure its not an ingrown hair since i havent shaved for a few weeks)

my underwear/jeans rubbed against me and ive has this for a couple days. its fine unless anything touches it, however it does feel like theres a pea sized hard area in it?

im confused.