Bullous Pemphigoid (or “BP”) is a form of the Pemph that causes blisters on the dry portions of the skin, particularly areas subject to flexure and where the skin is thin, such as the upper arms, thighs, and chest. BP usually comes with severe itching. BP blisters are usually have clear fluid and “tense”, meaning they do not break open easily (if they do at all). Blisters contain blood sera, which is the fluid part of the blood filtered of larger particles such as blood cells.
When blisters break, although they may become crusted over, they can leak for many hours. Persons having a severe flare can soak their clothing and sheets from the loss of fluid, much the same as if they were sweating. This loss of fluid can reach the point of dehydration, and in some environments can be an attractant for pests.
BP can spread to mucous membranes, though this is not typical.
(More to come)