Pemphigoid is a rare skin condition that causes large, fluid-filled blisters on areas of skin that often flex like upper thighs,armpits or lower abdomen. It is most common to people above 60 years of age. Pemphigoid normally occurs when the immune system attacks a thin layer of tissue below the outer layer of skin. Visit this site http://blog.drsundardas.com/category/allergies/ to view more about skin allergies and skin condition.