white spots on my male organ

It's difficult to say, because it could be caused by a number of different things. My guess is that you should start with a urologist, simply because many urologists are used to dealing with penile issues that are dermatological in nature; if it's dermatological but is more exotic than what he is used to handling, he can then send you on to a dermatologist. Also, be aware that skin issues are VERY common on the penis, due both to the thinness of penile skin and the fact that the penis is kept in a warm, moist environment that encourages bacteria, sweat, etc. Many simple penis skin issues respond to the use of a quality penis health cream (health professionals recommend Man1 Man Oil). Look for one that includes skin-sensitive ingredients like shea butter and a powerful antioxidant like alpha lipoic acid.  Good luck!