Hibuna gets "zits"?

[commongoldfish 0]

So, Ive had my Hibuna for about 2 years now, and he has always gotten what look like zits on his face (only). As well as these zits (he only gets one at a time, they end up disappearing after a few weeks), he developed what looks like a tumor(?) under one of his scales, and that is continuing to grow after having it for a few months. I have a second Hibuna (he is 4yrs) that has the same lumps under a few of his scales, but it has never hindered the two fish. 

They are eating regularly, are active, alert, no pineconing, no red streaks on fins, no eye-popping, no fungal growths, no symptoms/ appearance of paracites, no other sign of disease other than these zits and weird tumor lumps. 

My parameters are:

Amm: 0-.25ppm | NO2: 0ppm | NO3: 0-20ppm | pH: 7.4-8

Came here to get ideas, I have no idea what this could possibly be. Ive tried antibiotic soaks, salt, broad spectrum treatments, dewormed, you name it. I just dont want this to affect my fish later in their lives. First pic is the tumor lump, the second is of the zit. Thank you for any information. 

[koko 14,340]

Do these "Zits" ever burst?

Please copy & paste fill the following form and fill it out to the best of your ability when requesting help for Goldfish Problems:

Test Results for the Following: * Ammonia Level(Tank) * Nitrite Level(Tank) * Nitrate level(Tank) * Ammonia Level(Tap) * Nitrite Level(Tap) * Nitrate level(Tap) * Ph Level, Tank (If possible, KH, GH and chloramines) * Ph Level, Tap (If possible, KH, GH and chloramines) Other Required Info: * Brand of test-kit used and whether strips or drops? * Water temperature? * Tank size (how many gals.) and how long has it been running? * What is the name and "size of the filter"(s)? * How often do you change the water and how much?

* How many days ago was the last water change and how much did you change? * How many fish in the tank and their size? * What kind of water additives or conditioners? * What do you feed your fish and how often? * Any new fish added to the tank? * Any medications added to the tank? * List entire medication/treatment history for fish and tank.Please include salt, Prazi, PP, etc and the approximate time and duration of treatment. * Any unusual findings on the fish such as "grains of salt," bloody streaks, frayed fins or fungus? * Any unusual behavior like staying at the bottom, not eating, etc.?

[DawnMichele 6,045]

Welcome to Kokos and I hope your Goldfish feels better.

[commongoldfish 0]

The zits never pop, they simply shrink and disappear with time.

Ammonia: .25ppm
Nitrite: 0ppm
Nitrate: 30ppm
pH: 7.8
(Tap I would say is default 0 because I treat water with Prime with every change)

I use the API test kit (drops)
Water temp: 68-75
Tank size: 75g, running for 1 year with current bio-media setup (I use bio beads, more than recommended for 75gal)
I use an Aquafina 55g filter
I change 75+% water 1x/wk
Last water change: 1wk- 75%
# of fish: one 6in, four 2in
Conditioner: Seachem Prime with every water change 
Feed: Repashy Soilent Green 3x/day, Repashy Meat Pie 3x/wk
New fish: yes but they were QT'ed for 3 weeks (with prazi pro, paraguard)
Meds in tank: never, unless entire tank is infected with something, then I treat accordingly.
Treatments for fish: Prazi Pro about 6 months ago- full 7 day treatment. Paraguard 1hr soak treatment for 3 days about 1 month ago. Any other treatments happened a year or more ago (he has never showed signs of illness- no need to treat) 
Signs of illness: None other than these zits and the one lump in photo.
Unusual behavior: None. He is alert, active, eats regularly, and is not constipated. 

[shakaho 6,312]

Zits often occur at the site of a fluke attachment.  Since these go away, your fish has a good immune system.  I suggest you treat the tank with a minimum of two weeks of prazi.  Unlike most medications, prazi doesn't hurt the fish nor will it damage your cycle.  

Unfortunately, you can't do much about tumors.  If you remove them surgically, they usually grow back.  They don't appear to cause much discomfort to the fish, but look ugly.