A Columbia University scientist claims her boss — and former lover — repeatedly dropped his drawers and demanded she diagnose a lesion on his butt.

Associate Professor Mady Hornig says her boss at the university’s Mailman School of Public Health also demanded co-credit for her work; kicked her under the table at meetings to keep her from speaking; presented her work as his own, and kept her from getting tenure, Hornig claims in a Manhattan federal court lawsuit.

In 2014, Professor Walter Ian Lipkin, head of the Center for Infection & Immunity, called Hornig into his office and “demanded that she look at lesions on his buttocks,” Hornig alleges. He did so again a year later, Hornig charges.

Hornig is suing the school, claiming Lipkin has ruined her reputation.

Columbia declined comment.