Ask a Doctor and Get an Answer to Your Medical Question ASAP
Blood blister on lip that won’t go away or keep on recurring for months could be a sign of infection such as herpes virus or cold sores. Most blisters heal naturally and don’t necessarily require medical attention.
Given that you are having persistent blisters with new ones now appearing, I would recommend visiting a doctor for further evaluation.
They could possibly prescribe some specific treatment after checking you out,