Hi, dear I have gone through your question. I can understand your concern. You may have some soft tissue tumor like lipoma, neurofibroma or dermatofibroma. Your x ray is normal so no any bone involvement is there. You should go for fine needle aspiration cytology. It will give you exact diagnosis. Then you should take treatment accordingly. Excision is the treatment of choice for most of the benign lump. Consult your doctor and plan accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using health care magic. Wish you a very good health.