Ingrown hairs, boils, or cysts? Appeared after shaving, caused by chafing from wearing pads. Feel like pea sized hard lumps beneath skin. More info in comments
My son had a laparoscopic surgery when he was an infant. Every now and then, 10 years later, the tiny scar fills up and gets a black head. Got this cute little thing out of it just now! (No children were harmed during the squeezing)