This  is regarding my son who is 4 year old for the past 4 months he had a hard lump on lower part of his cheek.we had consulted the doctor on advice of her we had an ultrasound accourding to her  Its looks like a begnin small vascular abnormality( heamangioma). This may have grown due to an inflammatory phase. You cant notice this lump from outside. If you see very closely then only you can notice small swelling there. He had no other symptoms. The lump is painless.I am attaching the image for reference.