In the south it is extremely common to shave one's head, or at least crop it so close that it resembles a mixture of the U.S. Army crew cut, and the kind worn by Medieval Normans. There are both practical and social reasons. From a practical standpoint, once you get into the subtropical regions, hair can be rather uncomfortable, as well as prone to lice and infection. From a social standpoint, the racial mixture of the south meant that the wide variety of hair textures made catch-all means of treatment rather difficult, so the custom was to cut it as short as possible. During the times of blood quantums, it was also a way for Warlords to drop the question of lineage. It was also popular for members of the Non-Denominational church, as it helped unite all the Churchmen into one identity, as well give them a sense of anonymity when they're moved around from district to district.
Interestingly, as you go further and further south, the hair actually becomes somewhat longer and more elaborate. This is because the nobility of the deep south has taken to wearing wigs over their completely shaved heads. They favor lighter, even outright white hair for their wigs, but they're not powdered--they're usually made from livestock. They're also not the overly elaborate periwigs of the 17th and 18th centuries, but relatively simple--sometimes braided, but more common in the "Dutch page" cut, but bangs definitely feature heavily.
