Thanks for your query, I have gone through your query. The skin flap hanging from the site of extraction could be the excess buccal and lingual flap. consult a oral physician and get it excised. it cannot be clot because clot will dislodge following gargling or having food. It can be a excess tissue that is formed over your wisdom tooth that has been removed. get this excess tissue removed. i hope my answer will help you, take care.

Hello,
I have read your inquiry and understand your concern about a skin flap after your extraction. This indicates some bone loss before or during the time the tooth was extracted. Sometimes the wall of bone facing the cheek is very thin or nonexistent due to the angle of the tooth. This will leave you with excess tissue. It may shrink with time. You may have some of it removed easily by your dentist if you find it bothersome. I would not worry. Continue to rinse the area and gently clean with a soft toothbrush.
If you feel pain or swelling near the extraction socket, call your dentist for an appointment. If you feel you are having difficulty cleaning the tooth next to the extraction socket, I also recommend that you call the dentist.
Thank you for your inquiry. I hope this puts your mind at ease. If you are still concerned, please provide me with more details about the tissue such his color, texture and suze of flap. I am glad to answer additional questions.