There is no cure for face blindness. Treatment focuses on helping people with the condition find coping mechanisms to better identify individuals.
You could, for example, learn to focus on other visual or verbal clues to identify a person. This could include taking note of their curly blonde hair, their shorter-than-average-height, or their voice. You may also notice certain mannerisms, like how quickly they walk.
Many researchers are working on understanding specific causes of the condition and are looking for treatment.