Why does my goldfish have bumps under scales? How to treat at home?

Question

Hi, my cosmo goldfish' scales have small bumps underneath and I do not have any pet stores/veterinary offices to help near me. Would you be able to tell me what is going on with him? I have attached photos of him to give a visual. I am unsure why the third one may show up upside down and I apologize. Pet's info: Fish | Unknown - Fish | Male

Angel Alvarado, LVT · Accepted Answer

It may be minor infection (bacterial, fungal, parasites), trauma or simply normal for him. Monitor for rapid change or growth, lethargy, decreased appetite, bruising or bleeding. Maintain pristine water quality at all times. I would be hesitant to recommend any medication without more information or clear signs of illness or injury. A good sign is that I don't see clamped fins which can indicate stress or illness. What you can try is some plain aquarium salt (NOT table or Epsom salt). It is an excellent general tonic that can reduce stress, improve gill function, treat minor infection and aid in any recovery. Dissolve 1 tablespoon of salt per FIVE gallons of water in a cup or two of tank water and gently pour it into the tank. Treat for 10-14 days then reassess his condition. Partial water changes, no more than 30% total volume, can be done afterwards to reduce salinity. Use only aged or conditioned water that is temperature matched to prevent stress or shock. Goldfish do best between 65 F and 72 F.

Why does my goldfish have bumps under scales? How to treat at home?

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