Two Green Circles

Diane goes to the doctor, and says: "Doctor, I've got a bit of a problem. I'll have to take my clothes off to show you."

The doctor tells her to go behind the screen and disrobe. She does so, and the doctor goes round to see her when she is ready.

"Well, what is it?" he asks.

"It's a bit embarrassing," she replies. "These two green circles have appeared on the inside of my thighs."

The doctor examines her and finally admits he has no idea what the cause is. Then he suddenly asks, "Does your boyfriend wear earrings?"

The woman blushes and says, "Well, actually he does."

"That's the problem," the doctor says. "Tell him his earrings aren't real gold!"