Final answer:
The epidemiology of bullous pemphigoid revolves around its occurrence, distribution, and possible control factors within populations, differentiating it from bullous impetigo, a similar-looking but distinct bacterial skin infection.
Step-by-step explanation:
The epidemiology of bullous pemphigoid, a systemic autoimmune disorder characterized by large, fluid-filled blisters, isn't directly mentioned in the given reference material. However, the info provided relates to bullous impetigo, which is a skin infection leading to similar large blisters. The distinction between these conditions is clinical; bullous pemphigoid is an autoimmune disease, whereas bullous impetigo is caused by a bacterial infection, typically by Staphylococcus aureus or Streptococcus pyogenes. Both can cause bullae, but their etiology and management are different. Autoimmune diseases, like bullous pemphigoid, depend on genetic and environmental factors and can be associated with disorders such as diabetes mellitus type I, multiple sclerosis, and rheumatoid arthritis. A deeper epidemiological study of bullous pemphigoid would reveal its incidence, prevalence, and risk factors within specific populations.