How big is the tank? Did I change out any water when you got home?

Pictures would be most helpful too This could be a small infection in the mouth though, it might have gotten hurt and infected due to bad water quality. Maybe you should go buy some antibiotic medicated food and feed only that to your fish for a week and see if it helps? Other than that, I'd perform a 50-75% water change, and add some medicine to the tank as well, you could try melafix for instance.

goldfishsister your fish will probably die unless you get 40 liter tank and a filter very soon! All goldfish need a minimun of 40 liter of water space!

No it isn't. But at this size a 20 liter is good for now untill it grows bigger. Right now its small because it has been live in a bowl. Inside a goldfish will grow to the size of the bowl but the inside keep growing and kill the fish. Your fish could easily reach 8 inches if kept in good condition.

Right know if you can't get a bigger tank it would be a good idea to do a water change. You can also use a 5 gallon toat box filled with water for goldfish untill you are able to get a glass tank.
There is also a possibility that the bump is just a tumor and doesn't do harm to the fish untill it get to heavy.

Thanks for your advices. the people live in my zone, grows their fishes in small tanks.and my old goldfishes lived max 5 mounths. i am a new goldfishsitter So i hadnt know its dangerous untill read your advices. I change the water once in every two days. but to all appearances i must change the even bowl. and i want to ask one more question: is area's size of water exposed to air important for the first step? because i think take my goldfish to a big water container untill buy a big tank.

Youre right Nossie.
goldfishsister a 40 liter toat box is like medium sized plastic storage box.

and a storage box will be colored. doesn't it hurt my fish's state of mind?

i will choose one of clears i had couldnt thought it and my fish's white infection point is lacked. there is just red zone on the head.

thanks for your advices

Hi Weezer,

You should remove the carbon from the filter, since it can interfere with the medicine. Leave the sponge and the filter running. Maracyn can affect the beneficial bacteria in a negative way so keep an eye on your water parameters, especially ammonia and nitirite for spikes and do partial water changes if the levels rise too high.

Bacterial infection  is the cause of tail and fin rot, so fungus treatment will probably not work. Make sure you correctly diagnose the disease first..don't just throw in different types of drugs hoping they will work or you could end up killing your fish instead of helping.

First thing you should do is make sure your water is in perfect condition before beginning any type of treatment. I suggest you do a 50-60 percent water change first.

Walmart carries jungle antibacteria fish food, though i'm not sure they have in the store. They will ship it to you or to the store for you to pick up or you can call them and ask .

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Amazon.com also carries anti-bacteria fish food too.

Make sure you are using the correct medication. (Maracyn treats gram-positive bacterial infections, whereas Maracyn II treats gram-negative bacterial infections). Finrot if often caused by gram negative bacteria. You can use maracyn II in combination with jungle antibacteria medicated food, but keep a very close eye on your water paramaters.

Nabi's is right the carbon should be removed as it will absorb the meds in the water and make your treatment ineffective, and to add to Nossie' answer, zeolite will also give you crystal clear water... mmmm crystal clear water....
and Nossie, again, great advice but you know I have to ask the question, why do you need to remove the zeolite if you're planning to treat with salt along with the medicine? I spose its the same reason we remove the carbon? Cheers

cheers Nossie, and thanks, thats very interesting info regarding the zeolite, I just ditch it in the garden usually, and sorry to impose upon you another question but do you know how long the salty water would take to release the ammonia... regards> Ron

cheers Nossie,  did just that, took a little reading but I found a nice article on bio media that says once zeolite is saturated, it is usually possibl to recharge by soaking it in salty water for a few days... if anyone is interested in the bio media article its quite good and is at (Link is not visible to guests. Please register to view.)
I was using the zeolite to reduce the ammonia when I could see it rising while my tank was cycling, now that it has finished cycling (thanks to you all here for your help ) I could probably stop using it now... regards... > Ron