Dirt on breasts like boogers may be caused by lack of personal hygiene, resulting in breast secretions, sebaceous secretions, or apoptotic skin tissue remaining on the breast surface and gradually drying out. You can wash it with water and pay attention to the hygiene of the breast skin in your daily life. The actual fact is that the actual material grows in the breast skin, the clinical common in the flat warts, breast skin keratosis and so on. The common causes and treatments 1, flat warts: is a more common superfluous, is due to human papilloma infection caused by. There are usually no obvious symptoms, but a few patients feel a mild itching of the affected skin. It can be treated after a doctor’s examination and routine blood and urine tests. As this disease is contagious, so daily attention should be paid to personal hygiene, personal belongings dedicated; 2, breast skin keratosis: is a disease caused by hyperkeratosis of the epidermis, occurs in the breast, the affected skin is often dry, chapped, and even appear flakes and other performance, and the flakes and skin oil secretions mixed, can appear booger-like material. Symptoms often worsen in winter and decrease in summer, and some patients may have pruritus. Since the cause of the disease is not yet clear, it is suspected that it may be related to heredity, so conservative treatment is mainly adopted. Precautions daily need to pay attention to strengthen skin care, keep the skin moist, can be in the diet more intake of fresh fruits and vegetables rich in vitamin C, such as carrots, kiwifruit, etc..