Reticular cyanosis is a skin spasmosis, a skin manifestation of certain diseases, and some normal people also develop reticular cyanosis in cold environments. Gangrene is a specific morphologic change of black and dark green color due to secondary infection by spoilage bacteria and other factors after tissue necrosis. Both are seen together in the skin lesions of polyarteritis nodosa. Polyarteritis nodosa, also known as periarteritis nodosa and necrotizing arteritis, polyarteritis, etc., is a fatal disease. The clinical course of the disease is rapid and extensive, usually involving the systemic arterial system, and the clinical manifestations are complex and varied, depending on the site or organ involved. What are the dietary considerations? Patients should eat a diet high in protein; high in vitamins; high in calories; avoid greasy food; avoid fried food; avoid high salt and high fat food. Appropriate diet Lean meat: belongs to the food rich in protein, which is very beneficial to the body and can be supplemented with high-quality protein one per day can be boiled or stir-fried with other vegetables. Fruits: Rich in vitamins make it popular and the most popular fruits are consumed daily, preferably between meals. Eggs: rich in high-quality protein and essential vitamins, are high-calorie food daily, scrambled, boiled food can be, do not eat too much. Avoid eating diet fatty meat: is a particularly greasy food, and the processing of such food oil are of poor quality oil is recommended to eat less appropriate. Spicy pepper: spicy irritation, can cause increased permeability of the vascular mucosa, thereby increasing the risk of bacterial infection of the disease. It is advisable to eat non-spicy and irritating condiments. Pickles: the content of salt is relatively large, which can cause water and salt retention, thus increasing body wetness, which can cause an increase in the inflammatory response and increased local exudation is advisable to eat fresh vegetables.