Hi Welcome. I have gone through your query. It is difficult to comment on it without examination. I would suggest you either to see dermatologist or upload the picture for better assessment. Presently I would suggest you to avoid bursting it, wash it with dermadew soap. Apply hour compression and see observe for improvement. This provisional advice provided by me is based entirely on the input provided to me. I would suggest examination by the doctor. I hope this suggestion might be of some help to you. Take care.