I have an awful burn on my hand (base of fingers) and I was carrying a heavy box this morning, that’s made from wire. That’s the only explanation I have as I haven’t done anything else. It has come up in proper blisters that look like burns (proper burns) surely this can’t be from the carrying?
What was/had been in the box? Where had the box been?
For example, if it had been sitting in a garage, it may well have had something corrosive on the base. Even if the substance had dried up and all but disappeared, the heat of your hands could have rubbed off the last vestiges.