Are you sexualy active with any partners? If you are then you need to think about sexual transmit diseases. Are circumcised?
Masturbating not STD but it can be irritations,inflammation or bacterial infection. Dont try for any remedy, Get STD or Skin doctor for check and its very important to act now. You should take swab test before the ucler heal. How is chennai?
get it swabbed and tested asap!