Hello dear, Hello dear, I have gone through your query thoroughly. I will provide you with my best possible advice. Its really great that you have quit the habit. Now coming towards the problem, first of all you should not supposed to pierce that by yourself, But now when its broken, I think that this lesion is most probably due to any trauma like the one you said trauma to lip during the extraction if it was present since the extraction of your tooth, but possibility of tobacco can t be ignored. I advice you to visit your dentist so that he/she can do thorough clinical examination. Meanwhile You can apply topical gels like Kenacort/Tess/Oraways thrice daily over the affected part. • Eat more of green leafy vegetables • Take antioxidant+multivitamin capsules for 15 days • Hope this helps you. Take Care Regards