Hi,
Thanks for replying.
I am worried about the light brown patch under tip of my penis more then the burning sensation and i don't think i have applied anything on tip of my penis.
You must have applied something on the tip of your penis. Except for coconut oil, olive oil etc don't use anything else. From my experience I know, soap causes a burning sensation, also once I tried putting in a few rice grains, I had a very painful experience for a few hours.
Even creams and lotions might be harmful.