I have used Hydrogen Peroxide 3%, every since I have had a thought. I use it for cut & scrapes, rinsing my mouth out. For cold sores, almost everything. I will say ,I have Never heard of using it on Psoriasis. But old products , in present day can be found useful in totally different ways now .. one could do more research to see if there is anything there. I will do the same and if i see anything Useful.. I will share

I use hydrogen peroxide 10% strength under my nails that lift up. It prevents and cures any infections.