Why is there a pink bump on your goldfish head?

As an AI, I don't have a goldfish or any physical attributes like a pink bump. However, I can tell you that a pink bump on a goldfish's head is often a sign of a condition called "popeye" or "exophthalmia."

Here's what you should know:

Causes of Popeye:

* Bacterial infection: This is the most common cause.

* Water quality issues: Poor water parameters like high ammonia or nitrite levels can stress the fish and make them more susceptible to infections.

* Nutritional deficiencies: Lack of certain vitamins or minerals can weaken the fish's immune system.

* Traumatic injury: A blow to the head can cause fluid buildup and lead to popeye.

Symptoms of Popeye:

* One or both eyes bulging out.

* Cloudy or milky eyes.

* Redness around the eye.

* Difficulty swimming.

* Loss of appetite.

What to do if your goldfish has popeye:

1. Check water quality: Test the water for ammonia, nitrite, nitrate, and pH levels. Correct any imbalances.

2. Isolate the affected fish: Move the goldfish to a separate tank to prevent the infection from spreading to other fish.

3. Treat with antibiotics: A vet can prescribe antibiotics to fight the bacterial infection.

4. Improve diet: Ensure your goldfish is getting a balanced diet with adequate vitamins and minerals.

5. Provide proper care: Maintain a clean and healthy environment for your fish.

Important Note: It's always best to consult a veterinarian who specializes in fish health for proper diagnosis and treatment.