Red blood spots on the healing incision after surgery may be caused by skin allergy, incision infection, scar proliferation and other reasons. 1. Skin allergy: due to contact with allergens, local friction and extrusion, it may cause local skin allergy, so it leads to red blood spots on the healing incision after surgery. 2. Inflammation and infection: Because the incision has just healed, the local skin is relatively delicate, if you do not pay attention to local hygiene and cleanliness, the skin is subject to external stimuli, resulting in inflammation and infection of the incision, so the incision heals with red blood spots after surgery. 3. Keloid hyperplasia: If you have a keloid body, it may cause keloid hyperplasia after surgery, which leads to red blood spots on the healing incision after surgery. If there are red blood spots on the incision after surgery, you should go to the hospital in time to have a review and ask a professional doctor to diagnose and treat the problem.