Please help - my fish is developing pimples

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mnopq11

Aquarium Advice Apprentice
Joined
Aug 29, 2017
Messages
16
my fish is developing red pimples near its tail . water is clean. pls help
 
Would check water chemistry and post readings on ph, ammonia, etc and how long tank is set up. If all good then might be bacterial. Need a photo ideally though.
 
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