The redness of the big fish can be a normal physiological phenomenon, may also be cirrhosis, hepatitis, measles, eczema and other diseases. 1. Physiological phenomenon: if a normal person is well nourished and balanced, there can be a white and red phenomenon in the big fish head, which is a normal phenomenon, generally indicates that the blood circulation is better, this situation does not need to worry too much, should maintain a good state of mind. 2. Pathological manifestations: If you suffer from liver cirrhosis, chronic hepatitis, there can be liver palms, i.e., thumbs and thumbs of the root of the big fish, small fish appeared in the phenomenon of congestion, or red spots, plaques, and can be turned into a pale white color after pressing hard. Skin allergies such as measles or eczema can also cause redness between the thighs. The cause should be carefully identified and treated. If physiological causes can be ruled out, it is important to go to the hospital in time for standardized treatment to avoid delaying the condition.