The popular acne drug Accutane will carry graphic, unprecendented warnings by order of the Food and Drug Administration to protect pregnant women against birth defects. The new warning requirements, outlined in a May 19 government letter to Accutane manufacturer Hoffmann-La Roche Inc. of Nutley, N.J., would require a picture of a deformed infant to accompany the medicine. The letter was released Thursday. Doctors prescribing the drug, and their patients, will also be required to sign consent forms indicating they are aware of the risks of Accutane, which has been found to cause birth defects when taken by pregnant women.