Hello, Pemphigus vulgaris is a rare autoimmune disease that is characterised by blisters and erosions on the skin and mucous membranes, most commonly inside the mouth. It is an autoimmune blistering disease, which basically means that an individuals immune system starts reacting against his or her own tissue. Most patients first present with lesions on the mucous membranes such as the mouth and genitals. Several months later blisters on the skin may develop or in some cases mucosal lesions are the only manifestation of the disease.  Body-wide (systemic) therapy is needed to control pemphigus and should be started as early as possible. Systemic treatment includes: An anti-inflammatory drug called dapsone Corticosteroids Medications containing gold Medications that suppress the immune system (such as azathioprine, methotrexate, cyclosporin, cyclophosphamide, mycophenolate mofetil, or rituximab) However, side effects from systemic therapy are a major complication. In fact the the dose of omnacortil given by you is very less . It is generally given in the dose of 100 to 120 mg daily and is tapered in the dose of 5 mg every month over a period of more than a year. You should consult a very senior dermatologist as the treatment for this condition is very difficult and takes very long time. Thanks