It is rare, with around 0.08 to 0.5 new cases per million people per year, and it affects males and females equally.
Epidermolysis bullosa acquisita
Epidermolysis bullosa simplex
Ichthyosis acquisita
Ichthyosis bullosa of Siemens
Junctional epidermolysis bullosa 
Epidermolysis bullosa dystrophica
Urticaria pigmentosa
Dermatopathia pigmentosa reticularis