20 Gallon Tank Red marks on Danio?

Shade89

I've had this glofish danio for about 2 years now and today I noticed some sort of red blister on its scale and some more red marks on the opposite side of it's body. I've never seen this on any of my fish before. He also stopped eating pellets and freeze dried worms. Sadly this is my last fish and he's been swimming around in this tank all by himself for about 6 months, so there's no way he could have caught a disease from another fish.

Water conditions:

Ammonia: 0
Nitrites: 0
Nitrates: 10
PH: 7.4
 

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