Lipomas are soft, easily moveable masses under the skin that are always round in diameter.
They can appear anywhere on the body from the scalp to the legs, even inside the internal organs.
Usually, one patient has one lipoma at time, but, multiple presentation of lipoma is not excluded.
Checked this swelling under your chin with your physician.
It could be lipoma, but, it could be just swollen lymph node, if you were ill recently (throat, ear, sinuses, teeth infection)
CT scan, along with MRI does not allow an absolute reliable distinction between a lipoma and a liposarcom.
Best wishes!
Marija