Laser Hair Removal Burn Not Healing

I've been having laser hair removal procedures for some time with no problems. Last week during a Brazilian treatment the laser slipped and was extremely painful. Tech said it was a little red. That night it was hurting and couldn't get comfortable sitting or lying down. In trying to tell what was going on the blister popped on the burn. Not Healing & Painful 8 Days Later. Very difficult to see and can only see with mirror from a distance as it's on my backside which also means I can't get a good pic.