Urethral strictures typically follow infection or trauma.  In this case the 'trauma' was due to a geographically refined cultural practice of injecting paraffin into the penis to 'aid' enhancement.

The same process is performed - not by the medical estalishment - into female breasts to result in enhancement.

The size increase in the respective organs is due to a granulomatous foreign body reaction to the paraffin.  A so called 'paraffinoma'. Complications are common - in this case a deformed penis with a anterior urethral stricture.