I have a lump on my back and not sure who I should see for it.  It seems to have grown quickly, due to its size and having not noticed it before now.  It is completely under the skin, pretty hard, but moves when touched.  It is a little tender.  I first thought to make an appointment with my dermatologist, which I have for tomorrow, but now am thinking that maybe I should just see my general physician since it doesnt actually seem to me a skin issue.  Who should I see?
Hi and welcome to Chat Doctor. Thanks for the query. Well you should see a surgeon since it seems like to be SME benign subcutaneous lesion which should be removed surgically, and then it can be analyzed. Usually we find atheroma, fibroma or lipoma at this place and other causes are less common. Wish you good health. Feel free to ask. Regards