'Patients let me take pics'.
But when concerns were raised at the STD clinic, Dr Christopher Brett Valentine, 45, said he had only obtained the patients' verbal consent at the time.
The General Medical Council heard that the 10 men and three women visited Valentine at Inverclyde Hospital in Greenock in 2002, where he specialised in removing tissue and growths.
He admitted taking photos of the patients' genitalia for "educational purposes", but denies failing to obtain consent.
One patient told the panel: "He just asked if it would be all right to take photos of before and after for my own piece of mind."
But she said it was two months later when he sent a consent form for her to sign, stating the pictures would be used in a journal.
Valentine, of Birken-head, Merseyside, denies he is guilty of misconduct.
The hearing continues.