Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you with today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your wee one’s situation, and wanted to help.
Again I do apologize that my colleagues could not aid you sooner, but can you tell me:
Did the bulge only just appear 3 days ago?
What signs is Samson showing?
Did his vet xray the skull?
Any history of head trauma?
Can you take a photo of this? If you can do so,this will let me see what you are seeing. To post them online, you can use the paperclip icon on the tool bar above your text box. Or if you can't see that on your computer/phone, then you can post them on any other site (ie Flickr,Photobucket, imgur, etc) and paste the web link here for me to check.