Lump on child's head

Wanted to know if anyone has had something like this happen with their baby. My son is almost 5 months old and he's had this lump on his head for at least 3 months. It hasn't gotten any bigger or changed in color and it isn't painful for him. Pediatrician thought it was a deep hemangioma but we got an ultrasound on it just to be safe. Ultrasound determined it isn't a tumor but came back inconclusive as to what it is otherwise. Anyone have a similar situation or ideas as to what it could be? We're meeting with pediatrician again to determine next steps. Prayers/good juju appreciated!