What is that thing on the side of john mccains neck?

Question

every time i see John Mccain i see some "thing" on the side of John Mccain's cheek or neck. at first i thought it was just a camera trick or the angle of the camera but it seems to be there no matter what the angle. I'm sure everyone already know what this is but could you be so kind as to educate ME, please.

Answer 1

He is being treated for Melanoma, a form of skin cancer.

Answer 2

Well since the convention is in the Great Lakes area, he might have gone swimming and gotten a lamprey eel stuck on.  The fish in the lakes have been getting killed by these parasites and being from Arizona, he might never have seen one or know anything about them.

On the other hand, it might be something he got in Viet Nam and the VA won't treat it since he can't prove it is something he got while being a POW there.

There are many other possibilities, but not being a doctor, I really can't tell you anything else.