Lump On His Neck

I noticed this little lump on the right side of my Alan's neck, it's below his ear. It was very small yesterday and hardly noticeable, but this morning when we got up, it's big! not a pea size but almost a small grape size. I'm really worried now. I don't know what it is.  I guess it's a trip to a doctor.
 

 Update on my son's lump on his neck

Mr Sun came out today and it's pretty nice and warm outside. The big tree in the yard is finally budding out. I'm interested to find out what it is. Will it have flowers or will it be a pain during the Fall?

 Thanks for stopping by

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and 

Have fun!