The Traveller

A girl goes to her doctor, because she’s found some unusual green marks on her thighs.
After the doctor has examined the marks, she asks the girl some questions so that she can determine the cause.
“Do you have a boyfriend?” “Yes.”
“Can you describe him?” “Ok; he’s tall, dark, and works at the fairground.”
“So he’s a traveller?” “Yes, he is; any problems?”
“No, no. I do think his earrings may be made of brass, though.”