Two guys, in a doctor's waiting room, eventually get around to discussing their ailments.

One guy tells the other, that he is there to get a diagnosis on a red ring around his knob.

The other guy, astounded, says that he is also there with a similar problem, except the ring around his knob is green.

Anyway, the first patient to be called in the guy with the red ring.

Five minutes he comes out of the surgery and says to the other guy. No bother at all. Put some cream on it and the red disappeared.

The guy with the green ring was relieved to hear this and was called to see the doctor.

The doctor had a look at his green knob and said, "Sorry, but I will have to amputate it."

The guy says, "But you fixed the other guy with a smear of cream."

"Ah, yes", said the doctor, "but there is a difference between lipstick and gangrene."

Funny .