The reasons why a hard thing grows on the rabbit's chin:

1. Tumor or hyperplasia. There is a hard thing on the rabbit's chin. If it feels hard and feels sliding, it is probably a tumor. If there is no sliding feeling, it may be hyperplasia.

2. Parasitic and fungal infections. There is a hard lump on the rabbit's chin. It may be caused by parasites living in the rabbit's hair, or it may be caused by fungal infection.

3. There is a hard thing on the rabbit's chin. It may be that he has not eaten grass for a long time or eats less grass, which has caused abnormal growth of the molar teeth. Behind the jaw causes inflammation of the chin causing pustules.

Solutions for a hard lump on the rabbit’s chin:

1. Take the rabbit to the hospital for examination. If it is a tumor or hyperplasia, surgical removal can be considered. .

2. Rabbits should be dewormed regularly. Under the guidance of a veterinarian, appropriate anthelmintic drugs should be selected for the rabbit. The dosage should be determined according to the weight of the rabbit to drive away parasites.

3. If the rabbit suffers from fungus, it is necessary to clean the lesions and apply fungal drugs. If necessary, you can also choose injection treatment to avoid systemic infection.

4. If it is a pustule, wait until the pustule matures, then make a 1cm long incision on the lower jaw, disinfect it with normal saline, and use cotton balls to drain the surrounding pus.