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Hi. Welcome to Just Answer. My name is***** Thank you for your question about Powder. Can you take a picture of it and post it here with the paper clip icon?
I tried to open the image and something just didn't work. Can you try it again?
That one came through! How long has that area been present on the tail? Did it start small and then spread?
That area could be a focal area of dermatitis. Sometimes they can get a bacterial infection on the skin (it starts up due to a small injury to the spot sometimes) and it just sets up a moist dermatitis. When it gets fired up, if they lick it or bother it, it can just stay persistent. If the infection involves the hair follicles, it can cause the hair to not grow back in well. Could there be underlying hormonal issues that slow the hair growth? That is a consideration. If he was at my ER clinic, a course of antibiotics, cleaning that area daily and him wearing an E-collar would be most likely the starting point to see how this area responds.
I'm sorry for my delay getting back to you as I got pulled away. If it's not getting worse and it isn't bothering him, you could give it some time to see if keeping it clean and dry helps. I've seen some where they just don't ever really grow back their hair on the tail as the actual hair follicles get injured. I'm hoping for the best for this guy!