Hello, thanks for using health care magic. Medical literature does not point out any specific medical complications of masturbation per se apart from those that could result from trauma. During masturbation it is possible to sustained traumatic lesions of the urethra or develop urethritis. The dark of the skin is likely due to constant friction as you masturbate. It is also thought that masturbation may lead to severe addiction. This can lead to frequent stay in bed rooms, frequent touching of genitals consciously or unconsciously and even in public and reduce sexual response to opposite sex which may rather bring in psychological problems in your married life manifesting as poor satisfaction of your partner. A good way of cutting this would be by getting a partner or getting yourself busy and avoiding pornographic and or romantic films, novels or scenes. Best regards and hope this helps you. Dr Achuo