thank u for posting ur query here. based on ur explanation, ur case seems to be quite interesting. If the dentist
u have visited has not seen such a problem before, then it could be a rare form of a Problem.
Based on ur complains i would not call it straight away as a haemangioma. bleeding of gums is one of the common problems people complain off. i would advise u to take an opinion from a nearest Maxillofacial surgeon available at your place. Its not wrong for u to take a dermatologist's opinion regarding the same, probable he/she would definately though some light on ur problem and guide u further. The explaination that iam giving u is solely based on ur query alone and iam not addressing ur problem because i havnt assessed you. Thank U,