A source told The Sun newspaper: "Michael's test showed spots of skin cancer on his body, and cell which could turn to skin cancer on his face.
"He was at first very concerned, but says he has been assured by the doctors that they can treat this and he will recover.
"Michael is really looking forward to his concerts and is determined to wow his fans at each and every gig."
The source added: "He said he's insisted that any treatment must fit around the concerts, and the show will go on."