Around a week ago I noticed very sudden fur loss on my hamsters face and stomach, they also appear red. This started around the time I introduced new bedding, since then I have swapped it out to its old bedding and he seems to not get any worse. However he is not starting to look any better, I am wondering if it could be something more than just irritation or if it is how long itll take to notice improvements. His behaviour is normal, no weight loss or gain and doesn't seem to be grooming any more than normal.
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This is the best photo i can get at the moment!