Erythema Nodosum????

My niece has been having these bumps for at least 1 1/2 months now and has been to the dermo 2 times so far. The second time was since they didn't go away and she was even getting new ones. They want to do a biopsy now and she doesn't want that but I have been researching and told my sis it might me... show more My niece has been having these bumps for at least 1 1/2 months now and has been to the dermo 2 times so far. The second time was since they didn't go away and she was even getting new ones. They want to do a biopsy now and she doesn't want that but I have been researching and told my sis it might me absolutely necessary. Just wondering if anyone knows anything about these bumps (she has them on her arm too and in the beginning I know she had canker sores in her mouth as well). I am getting nervous about the other diseases that associate with that sometimes. What do you think should happen next (tests)? Is that the right kind of doctor to continue this?
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