Style Book magazine reported that lips are a mirror of health, as their appearance can indicate several health problems. The cause of cracked corners of the mouth lies in malnutrition, lack of nutrients, or a fungal infection, while the appearance of blisters on the lips indicates herpes infection.
The change in lip color to blue is an alarm bell, indicating the presence of a serious health problem, such as a lack of oxygen resulting from lung or heart problems, a circulatory disorder, or poisoning.