Fiqh-us-Sunnah Volume 5, Hajj and ‘Umrah, Fiqh 5.117.
Section : Passing Razor over a Bald Man’s Head.
The majority of scholars is of the opinion that in the case of a bald man, who has little or no hair at all, it is desirable to pass a razor over his head. Ibn-ul-Munzhir said, “All reliable scholars agree that a razor be passed over the head of a bald man.” In Abu Hanifah’ s opinion passing razor over the head of a bald man is obligatory.