I recently noticed this bald patch on my kitty's back and have no idea what's going on with it. He has allergies but I haven't noticed him scratching or licking more than usual. Everything else seems fairly normal for him and his fur looks healthy and shiny. I have noticed some tufts of his hair around the house but he's always been a bit of a shedder, especially this time of the year so I don't know. Any ideas what could cause this?