I had a blood blister in 2021. It didn't hurt. I went to immediate care who reffered me to a dermatolgist and she said it was ok. Not skin cancer or anything. Just to switch up my shoes and wear a gel insole. Now 2 years later its back. It hurts. It hurts to walk on it. And its black. Idk. Normally I jump the gun when going to the doctors for something. But if theres something actually there.....