I have an issue

Let me start off saying I don't know any technical words or anything so please don't roast me.😂 So I've had sex 3 times, the 3rd time was about 2 days ago and yesterday I realized that there is a small, hard bump like right on the outside of my vagina (idk what the technical word for this part is😂) it doesn't hurt but it wasn't there before I had sex. I used protection and it doesn't hurt, I was just wondering if anyone could tell me what it is??