Hi Dear, Welcome to HCM. Understanding your concern. Understanding your concern .As per your query painful black spots on the lips . There can be a few causes for it like any traumatic injury leading to hematoma formation or a fibroma. It can also be a sebaceous cyst or a mucous cyst or mucocele . While at times it can also be a malignancy .There can be many reasons for ulcers to occur like minor injury to mucosa due bite ,hard food ,acidic food or any dental appliances,poor oral hygiene and infection like thrush .In your case these probably are aphthous ulcer.Usually they resolve by themselves in few days . I would suggest you to avoid spicy food and acidic drink.do warm saline rinses .use antiseptic mouthwash like chlorhexidine and brush your teeth twice a day. Also apply cold compresses on lip and protect it from direct sunlight . If the condition do not resolve in 4-5 days then consult dentist for proper examination and to rule out other conditions like canker sore .Doctor may perform scaling and prescribe oral antibiotics. Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari