Sore next to my pubic area?

Does anyone know what this could be? I have been with the same partner for 10 years so I know it’s not anything sexually transmitted unless he cheated. I just noticed this open sore around my Bikini area that keeps oozing this liquid. I accidentally touched it and it feels like a hole/ulceration and that’s how I noticed it. It doesn’t hurt or itch or anything. I plan to get it checked out by a doctor but I’m just wondering if anyone had anything similar. It could be an ingrown hair. It’s been really hot and I’ve been sweating a lot as well idk if that’s what caused it or not. Any ideas?