The ulceration is mainly due to the deterioration of water quality, which leads to the growth of bacteria in the depression of the head tumor, and then other fish will eat the mucus secreted by his body, leading to injury, infection and ulceration.

When goldfish have symptoms such as rotten heads and tails, most of them are caused by water quality problems, and of course, they may be bitten by other goldfish when they are mixed.

We can use salt and potassium permanganate together, and the effect is better. Of course, it is also necessary to increase the number of water changes appropriately to ensure the cleanliness of water quality and prevent infection.

Choose a thin bamboo toothpick for disinfection, and then buy medical absorbent cotton and wrap it around the bamboo toothpick. At this time, you should disinfect your hands and take out the lion's head from the fish tank. The movement should be light and keep the vertical posture of head up and tail down. First, dry the head of the lion-headed goldfish with the prepared medical absorbent cotton, and then dip the cotton swab into the prepared mercuric chloride to smear the affected area.