Bullous pemphigoid (BP) is one of the types of pemphigoid that causes blisters filled with fluid in certain areas such as palms, lower torso, armpits, groin, soles, inner thighs, etc. the fluid inside the blisters may be clear or bloody. The skin around the blisters appears as red, inflamed, raised, and irritated patches of skin that do not burst easily. The areas covered with blisters may range from a few millimeters up to a couple of centimeters.