A well healed incision with a blood blister may be related to the pulling of the wound, which can be recovered by itself; it may also be caused by infection, which needs to be treated with medication. 1. Stretching of the wound: postoperative strenuous exercise or improper posture may cause stretching of the wound, the wound tension increases, resulting in good wound healing but long a blood blister, can be absorbed after a period of time, do not have to worry too much. 2. Infection: If the postoperative wound cleaning is not in place, it may lead to localized infection of the wound, resulting in inflammatory exudation, leading to an increase in wound tension, resulting in a well healed wound but a long blood blister. Open drainage and anti-infection treatment may be required. When the incision heals well after surgery, you should also pay attention to wound hygiene and care, as well as pay attention to the regularity of work and rest and eat a light diet to avoid adverse consequences.