What is a white bump on my betta fish?

In this post, we will answer the question “What is a white bump on my betta fish?”. We will also discuss some possible treatments and solutions to this issue.

What is a white bump on my betta fish?

Betta fish tumours can appear as bumps and patches on the fish. They can be found just below the surface of the water, creating lumps. They can also develop on your pet’s exterior scales, as well as on interior organs and tissues, depending on the species. 

In the Betta fish, a tumour can be found anywhere on the fish, and its size and position can vary (including the tail, side scales, a tumour on the head scales (interorbital area), or internal organs) (such as a brain tumour). Smaller tumours may not have a significant impact on your pet, but a bigger tumour may make it difficult for your Betta fish to swim through the water. 

It is possible that a tumour on a Betta fish is not a malignant development in some cases. These tumour growths in Betta fish that have become white are more frequently associated with:

–       Abscesses

–       Ulcers

–       Other conditions

It could be an abscess

The white tumour you notice on your fish is more than likely an abscess produced by a bacterial infection rather than a dangerous tumour growing on its body. 

Scale discolouration is most commonly caused by fungal diseases. External tumour morphologies induced by bacterial infections have a solid look, but growths caused by fungal infections frequently have a porous appearance, similar to that of a piece of cotton. 

The ‘white tumour’ produced by bacterial infections develops as a result of an injury to the skin. They can be caused by bumps during water changes or tank cleaning, aggressive tank mates, or they can be self-inflicted by rubbing against hard surfaces. 

In most cases, an abscess will heal on its own, but filthy water may allow germs to enter the incision. A big hole on the side scales or torn fins is left behind if they are left untreated until they rupture.

It could be an ulcer

An ulcer is another type of white tumour-like damage that occurs often. However, they frequently start as a lump with red discolouration surrounding it, before developing into open sores. A breakdown in your pet’s immune system is frequently the starting point for an ulcer in his or her skin. 

The damage caused by the exposed wounds has the potential to induce lifelong scale loss. Ulcers can also serve as a gateway for bacterial or fungal illnesses to infiltrate your Betta’s body through the skin. 

Minor bacterial or fungal infections will normally clear up once a water change is performed. (or eliminating other potential hazards in the water column). More severe illnesses will necessitate the use of antibiotic medications, which will be dissolved in the water of the aquarium or hospital tank.

It could be some other conditions

Tumour-like lumps around and on the scales of the skull are a possible adverse effect of Columnaris. It is possible for abscesses on the Betta fish’s head to be caused by bacterial growth or parasites, such as those that cause Betta velvet. 

These issues can be resolved with frequent water changes and the use of medications. An inoperable cancerous Betta fish tumour on the head scales is a fatal diagnosis; there is nothing that can be done to remove a tumour without inflicting such severe discomfort on the fish that the fish dies as a result of the procedure. 

Bacterial infections in Betta fish can result in masses on the side scales that look like tumours. Additionally, swim bladder illness has been linked to tumours that appear on the sides of Betta fish scales or the belly of the fish. 

Bacterial growths that are persistent and do not subside on their own should be treated. Swim bladder disease-induced tumour forms or lumps may typically be addressed by restricting meal quantities to reduce swelling.

What is the chance of my betta fish having a tumour?

A tumour on a Betta fish is a very unusual occurrence in the aquarium. Pets are more susceptible to several illnesses and injuries than people. If you detect anything that appears to be a tumour, it may be a sign of something else completely.

A variety of conditions, including swim bladder illness, constipation, and even fluid retention, can cause swelling or lumps that resemble a Betta fish tumour. Bacterial infections can lead to the development of an abscess or ulcer in your Betta (fungal infections usually cause discolourization or growths that appear like cotton). 

Aquariums with bad water conditions and aggressive tankmates that bite will also generate signs that appear to be tumours in the form of swelling.

How to treat a tumour in a betta fish?

Unfortunately, if your betta fish develops a malignant tumour, there isn’t much you can do to prevent it from becoming fatal. If your pet gets a tumour, you must consider the impact this will have on his quality of life. As long as the betta is swimming around and eating, it’s probably a good idea to keep him alive for a little bit longer. However, if your fish seems uncomfortable or uninterested in eating, it may be necessary to euthanize him immediately. 

However, there have been instances in which individuals have successfully had their betta fish operated on to remove tumours, although these are the exception rather than the rule.

When euthanizing your betta is the solution?

When your betta gets a malignancy that cannot be healed, the only compassionate course of action is to euthanize him humanely. You may find countless articles regarding the most humane approach to euthanising your fish by conducting a fast Google search. 

However, we recommend that you use a treatment like as Fin-Quel or something similar, which you can acquire through your veterinarian or from a reputable fish retailer. These medications are originally designed to be used as sedatives, but an overdose will send your betta on his journey to fishy paradise in a matter of minutes and without any fuss. To be on the safe side, always get professional counsel from your veterinarian before performing the ultimate deed.


In this post, we answered the question “What is a white bump on my betta fish?”. We also discussed some possible treatments and solutions to this issue.

If you have any thoughts or doubts, feel free to drop us a comment below!

Frequently Asked Questions (FAQs): What is a white bump on my betta fish?

What is the source of the white spots on my betta fish

Ich, often known as “white spot illness,” is caused by a protozoan parasite known as Ichthyophthirius multifiliis, which translates as “Fish Louse with a large number of offspring.” Cryptocaryon irritans are the organism that causes the saltwater variant of ich, often known as white spot illness. Both parasites have a complicated life cycle, which makes it difficult to cure them effectively. 

What is the source of the lump on my fish? 

There are a variety of possible causes for this bulge, including a tumour, an ulcer, a viral infection, or even an abscess. If this is the case, you should conduct a thorough investigation and take immediate action, which may include seeing a veterinarian. 

What does a tumour look like on a fish?

The majority of tumours are visible as bumps or lumps beneath the fish’s skin. However, the position and indications of the tumour might change from one fish to the next, and the type of tumour has a significant impact on these differences. It is unfortunate that indications of internal tumours or malignancies only manifest themselves after it is too late to save the fish from death. 

Is it possible that Ich will go away untreated? 

Because therapy is typically effective, you should plan on treating the afflicted fish and water for many days, rather than a few hours every day for a week. Additionally, you will need to treat the water since Ich comes in three different forms. 

Is it possible for a fish to survive Ich? 

This creature is an obligatory parasite, which implies that it cannot survive unless there is a source of live fish to feed on. It has the potential to cause widespread fatalities in a short period. An epidemic of “Ich” is a medical emergency that necessitates prompt care since, if left untreated, this disease has the potential to cause 100 per cent fatality. 

What is the temperature at which ich is killed? 

The temperature of the hospital/quarantine tank should be raised to 80°F as part of a validated ich treatment strategy to accelerate the disease’s progression through its lifecycle. 

What is the most effective method of treating white spot disease? 

If your doctor determines that topical creams, UV light treatment, or oral medicine will be beneficial in restoring skin colour and preventing the spread of white patches, he or she may prescribe them. Skin grafts can also be used to remove tiny areas of white skin that have developed on the body.


Betta Fish Tumors: How to Identify & Treat a Growth, Lump or Abscess on its Side.https://japanesefightingfish.org/betta-fish-tumor/

Betta Fish Tumor – Symptoms, Causes, And Treatment. https://www.tankarium.com/betta-fish-tumor/

15 common Betta Fish Diseases (With Pictures): Prevention and Treatment. https://pethelpful.com/fish-aquariums/diseases-of-a-Betta-fish