The small penis of a boy can be surgically lengthened and thickened, but there are certain drawbacks to this method and it should not be used arbitrarily. Male penis size is affected by a variety of factors, such as heredity, endocrine, disease and so on, will affect the development of the penis. At present, there is no drug that can promote the secondary development of the penis. If there exists a shorter, thinner penis, you can consider taking penile prosthesis implantation, penile lengthening surgery and other ways of treatment. It should be noted that surgery carries a certain risk of failure, and sexual dysfunction such as erectile dysfunction may occur after surgery. Prosthesis implantation, in particular, requires regular replacement of the prosthesis and is expensive. Patients are advised to take into account their own situation before considering whether to undergo surgery.