Ok, bare with me here. Alright, how do i loose nipple fat"? thats the best way i know to put it. Like, my pecs are pretty developed except for that area. Hope that knida makes sense ha!

Lose body fat. Simple as that, well, and exercising to add some muscle in there as well

The above answer is no joke: it's correct. You must take steps to decrease body-fat in general. The thing is, you'll most-likely lose it in reverse order of how you gained it (some people tend to gain in the butt & hips first, then the gut, then the chest, while others may gain in the chest first, then other areas later, & then lose it in reverse-order of gain) -- so it may take awhile for you to see the striations in your chest.

A lot (miles & miles) of daily walking will help burn calories & fat quite quickly (but unless you adjust your eating habits to be good habits, then you'll gain it all back quickly -- & often more than before ). Start out slow & short-distance & work up from there in both pace & distance (I'd recommend increasing distance up to a mile or two before increasing pace, although you may find your pace increasing along the way without any focused effort on it, & that's a good thing). Weight-training is also great for burning calories & fat. Steve Reeves, one of the most famous, best-looking natural bodybuilders of all-time mostly weight-trained & walked.

So learn about good nutrition & apply it while you exercise well & you'll eventually get great results.

Take Care,

Marooned Mike

P.S.: If & when focusing on chest training, be certain to emphasize back rowing-type exercises & rear-delt reverse-flye exercises even more-so (keep the back tighter/stronger than your chest else bad things will eventually happen to you: specifically, your arms will easily pop out of socket if your chest muscles overpower your rhomboid & rear-delt muscles).