There are dozens of small and soft sarcomas on the head of the red lion goldfish, which are plump and cover the cheeks and eyes, and the appearance is swollen and rich, hence the name lion head. The head sarcoma of the national lion goldfish is thick and convex, and there is sarcoma on the gill cover, which is square or strawberry-shaped from the front. The head characteristics of these two goldfish are obviously different, which can be distinguished by observing the shape and position of sarcoma.