To plonisalmonis,
I love the way everybody in the CR is a medical expert, even though most of them didn’t go to Health Science’s school. And yes, all those doctors are probably wrong. (And I’m just a student.) I can’t say for sure what it is without testing, but I think you have Tinea Manuum, which is a fungus. This is commonly misdiagnosed. The treatment for this is Loprox lotion for about a month. This might not work because the rash is long standing. If it doesn’t work you will need to take oral anti-fungal meds such as Sporanox.