Bullous pemphigoid is a skin condition that can cause a rash, itching and blisters.
There are several skin conditions which cause blisters. It is important to know exactly which disease you have as they have similar sounding names but vary greatly in their seriousness, outlook (prognosis) and treatment. For example, see the separate leaflet called Pemphigus Vulgaris (which is generally more serious than bullous pemphigoid).
This is a companion discussion topic for the original article at https://patient.info/skin-conditions/bullous-pemphigoid-leaflet