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)
sorry about the dirty hands, just came from work and this stuff is impossible to get off. But does this blister look infected? 3-4 weeks old from working on car.