What's up with Shiloh?

This is from the mom and gotta be quick since me and Shiloh are headed off to the vet to see if we can find out what this is->

 (this is the best pic I could get but still not good.)

It is less than 1/4 inch off the skin and about as round as a usual size pencil eraser.
I first noticed something in this same spot a couple of weeks ago but by the time we got to the vet, it had almost disappeared - it looks a lot worse this time.  I hope it is not what my first thought was - I have had a melanoma removed and I know the signs to look for.


Ok - I will update when we return if there is any updating to do about Shiloh.  If anyone is so inclined to say a little prayer, it would be much appreciated.
Gotta go for now,
Kim and Shiloh