For Bechet's Disease:
Please read this article:
Potassium iodide in dermatology: A 19th century drug for the 21st century—uses, pharmacology, adverse effects, and contraindications
My husband had something that was similar to Bechets or it could have been pyoderma gangrenosum. His skin blistered and started to ulcerate in spots, it was terrifying. I ran across this article and we started him on potassium iodide 1200 mg per day divided into 4 doses (300mg 4 times a day). Yes, you read that right, mg, not mcg. It immediately started healing his ulcerations which had been rapidly worsening. He took that dose for 2 weeks and then took one additional week to wean off. Highly recommended.