The 51-year-old victim was in the 100 block of Eddy Street at about 11:50 p.m. Wednesday when a man approached her and reached into her pockets, according to police.
When the victim resisted, he bit her ear, then took the cash and ran away, police said. The woman did not require hospitalization for the injury.
The suspect, a man around 40 years old, remains at large. Anyone with information about the robbery is encouraged to call the Police Department's anonymous tip line at (415) 575-4444 or send a tip by text message to TIP411.