I have a painful under fingernail unhealing thing going on. I spray Hydrogen Peroxide on them twice a day and it heals but then the issue returns.The stinging of the H2O2 under the finger nails is every time I spray H2O2. Like an infection under my finger nails, all of them). I have a wound on the thumb, a slight cut that will not heal. It keeps on painful and comes and goes. It heals and then if I do any work with my hands, the thumb wound opens up again.