The wart on the back is usually referred to as warts, take it and still grow to consider the treatment is not complete, low immunity. 1. the treatment is not complete: warts is human papilloma virus infection caused by the skin surface benign redundancy, including common warts, flat warts, toes warts, most of the need to be removed by laser freezing and other methods, if the treatment is not complete in the time of the common warts not completely completely removed, it is possible to grow out again. 2. the immune system is low: after the removal of the warts, only the symptoms disappeared, but the body of the human papilloma virus still exists, when the human body immunity is normal, the skin is not broken, the virus can not be replicated, reproduction, but the immune system is low, the virus will be reproduced, replicated, caused by the epithelial cell abnormality proliferation and differentiation, the warts will be out of the way again. Warts recurring should be to go to the hospital, standardized treatment, to reduce the adverse effects of the disease. Usually, you should strengthen the exercise, pay attention to personal hygiene, improve the immunity.