Hamster losing fur?

Hamsters fur seems to be thinning everywhere except head. No fur loss around eyes or ears. Major hair running on back and stomach. It’s not noticeable until she’s picked up and the fur is moved aside. Thought at first it was just active scent glands. She’s not scratching herself and is eating, sleeping, and playing... show more Hamsters fur seems to be thinning everywhere except head. No fur loss around eyes or ears. Major hair running on back and stomach. It’s not noticeable until she’s picked up and the fur is moved aside. Thought at first it was just active scent glands. She’s not scratching herself and is eating, sleeping, and playing normally. Her cage has been completely cleaned and disinfected with soap and bleach.
Update: Been like this for about a week. It doesn't seem to be bothering her as she acts normal and is very okay with being picked up and played with. Only had her about a year or a year and a half and besides messy hair/slight hair loss from very active scent glands, this hasn't happened before.
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