I can understand your concern. But you also need to understand that you have given a very limited history about your problem for us to comment on it. and also that your case needs a full physical examination. By
Upper thigh do you mean the groin area?
See common swellings in that area could be a enlarged lymph node or a lipoma or anything like that.
Kindly consult a general surgeon for further evaluation and management of your case.
Dr. Anil kumar jain.