actually I would say more like hundreds of millions.
I remember reading somewhere that around half of the male population in Tibet has suffered from EC at some point in their lives.
I think people are more prone to it in countries with colder climates, third world countries... even in North America there are many, many sufferers.
The number of undiagnosed cases is likely staggering.
Many are walking around with mild cases and peel the lips whenever they can as well to hide it and never see a doctor.
Go to a doctor they send you home telling you you have chapped lips, impetigo, dermatitis ect.... EC is one of the last things they would diagnose you with and takes a ton of visits on the patients part to ever even realize... a ton of trips most people won't make.