Blood on the skin at the tip of the nose can be considered to be due to localized skin capillary dilation. Usually this condition can be considered as hormone-dependent dermatitis, helminthic mite disease and rosacea. 1. Hormone-dependent dermatitis: due to the long-term use of hormone-containing drugs or cosmetics, resulting in thinning of the skin, capillary dilatation, can also cause capillary dilatation of the skin at the tip of the nose, redness and other phenomena. 2. Mite infection: the T-zone of the human face belongs to the sebaceous gland secretion parts, and the helminth mite is very easy to parasitize in such areas, which in turn causes localized redness of the skin on the face, and in mild cases, redness is manifested. 3 Rosacea: caused by genetic, neurovascular dysfunction, impaired skin barrier function, immune inflammatory response, follicular worm infection factors caused by rosacea, will also appear in the local skin dendritic capillaries (blood filaments); this disease is mainly involved in the face of blood vessels and sebaceous glands and hair follicles in the rich parts of the face (eg, nose). In addition, dermatitis, dermatophytes and other causes of damage to the skin stratum corneum will also have localized skin symptoms such as blood filaments. It is recommended that patients go to a regular hospital in time to clarify the cause of the disease and receive treatment under the guidance of the doctor.