Yesterday I was riding my bike, when my mother noticed a small garter snake. It wasn't move, so I touched it. It moved it head, so I picked it up, and noticed a very, very faint lump in it's throat. It's high enough that it's preventing it from turning it's head, and i think it is having trouble move, too. I've tried leaving it outside to see if it will slither away, but I come back an hour or two later, and it's still there!
Is there anything I can do to help it?