Thank you for your query.
It is surprising that the ringworm infection has not been controlled for months now. In this case either it is not ringworm or the right medication has not been advised. Though you have mentioned about a "bublble under the skin" which slides, you have not mentioned its size, location and consistency. I can only presume it to be of pea size around the proximal joint where the ringworm infection is situated. If that is right then it could be an enlarged lymph node
draining the area. Control of the infection should also make this swelling settle down over a period of time. I suggest that you seek a second opinion
and act accordingly.
I hope I have answered your query to your satisfaction.
Wishing your daughter all the best...