A Few Months Ago I Wanted To Get Tested For

A few months ago I wanted to get tested for STDs because I had ended a relationship I used a mirror to look for signs of herpes, even though there was no itching or pain. For the first time I noticed a raised, round, pink/purple mole that was close to my anus and inside my left butt cheek. I am not sure how long it's been there as I cannot feel it and have never really looked between my butt cheeks before. I don't know what it is and I just want to make sure it is harmless or know if I need to see someone. I tried to pop it and it bled a little due to excessive squeezing. It's not going to pop because it is kind of hard inside. Can you help me?