TORONTO - An Ontario doctor could have his licence revoked for a second time for allegedly sexually abusing a patient.

Dr. David Stuart Lambert's appearance today before the Ontario medical college's disciplinary committee will be his third.

In 1991, his licence was suspended for six months after the College of Physicians and Surgeons of Ontario found he made sexual comments to patients.

Then in 2002, his licence was revoked after the college found Lambert sexually abused one female patient, made sexual remarks to two others and tried to sell skin care products.

The college decided in June 2009 to reinstate Lambert's licence, but he was only allowed to treat adult male patients.

Four months after Lambert's licence was reinstated, it's alleged he touched the breast of a patient -- who was actually a private investigator sent by the college.