Pemphigus vulgaris is a rare autoimmune disease characterized by blisters and erosions on the skin and mucous membranes. It occurs when antibodies in the immune system mistakenly attack proteins that bind cells together, causing them to separate. Symptoms include painful blisters in the mouth and sometimes on the skin. It most commonly affects people between 50-60 years old. Diagnosis involves skin biopsy and tests to detect circulating antibodies. Treatment focuses on decreasing blister formation using oral corticosteroids and appropriate wound care, while minimizing activities that could further damage the skin.