Testosterone is associated with the various physical changes occurring in the body during puberty, especially in males such physical changes include an increase in height, muscle growth, pubic hair growth, and enlargement of the male reproductive organs. There is some evidence that indicates that testosterone levels may rise during masturbation, ejaculation, which is the result of masturbation, does not significantly affects the levels of testosterone, semen ejaculated after masturbation is not the primary source of testosterone. Masturbation does not stunt growth, but excessive masturbation might affect your normal testosterone level and which may affect growth. Next steps you have nothing to worry about, just make sure you don't masturbate excessively. Health tips if condition persists or worsens visit the er at the earliest.