Just picked up some spray and advised DBF no more hydrogen. I'll ask him to take a pic and I'll post it. I'm certain it's not a fungus but a scrape -- the top layer of fur and skin is missing and the wound was bleeding just a tiny bit, mostly weeping. It wasn't there Saturday morning, only after zoomies at my gf's house. He's home sick today so he's making sure she's not licking it.