Yuck!!! Thankfully we don't have those where I am....however my neighbor was out in Harrow last week, with her pup....showed me this bump that she says just got bigger over the last few days. It looked just like that second pic....I told her at the time, it looked like a tick....dang lucky guess, since until now I had no idea what a tick looked like!
Let us know what the vet says please....praying its nothing serious.