Could it be a tumor or Lipoma?
Thank you for sharing your question and photographs. Based on your narrative and location of the mass this seems most consistent with a lipoma but should be evaluated by a surgical specialist with an in-person examination for a presumptive diagnosis and discussion of treatment options. Hope that this helps.
Lipomas typically feel soft to touch. They are usually soft and shaped like a dome. Most lipomas don’t cause any pain or other symptoms. Removing the lipoma is recommend if it is large or growing and if symptoms are being caused, such as pain. It would be best to have a physician physically examine this lump and provide recommendations. A true diagnosis of lipoma is only made by a pathologist after the mass has been removed. Radiographic imaging can aid with diagnosis, surgical planning and determination of extent of invasion into surrounding tissue may be recommend prior to surgery. Consult with a plastic surgeon who can minimize the size and extend of the incision. Best of luck!