Red blood on the face, may be caused by physiological factors, such as congenital factors, environmental factors, etc.; may also be pathological factors, such as hormone-dependent dermatitis, rosacea and so on. 1. Physiological factors: (1) Innate factors: the individual skin horny layer is thin, the naked eye looks more obvious subcutaneous capillaries, the face is prone to red blood-like changes. (2) Environmental factors: dry climate, ultraviolet radiation, flame baking, the use of exfoliating supplies too many times, spicy food, addicted to tobacco and alcohol, may lead to capillary expansion, the face is prone to red blood. 2. Pathological factors: (1) Hormone-dependent dermatitis: long-term oral or topical glucocorticosteroids, there can be adverse reactions to the drugs, resulting in skin flushing, thinning, capillary dilatation, etc., which may lead to dilation of capillaries in the face, the face is prone to redness. (2) Rosacea: the etiology is more complex, may be related to heredity, impaired skin barrier function, etc., the appearance of facial flushing, capillary dilatation, pimples, etc., can also lead to capillary dilatation of the face, the appearance of red blood lines. Regardless of the cause of redness on the face, it is recommended to take good care of the skin on a daily basis, pay strict attention to sun protection, and do not often be in a hot or cold environment. If pathological factors are suspected, it is recommended that the patient go to the dermatology department of a regular hospital in time to get a clear diagnosis and treatment as soon as possible.