Dear Welcome to HCM We understand your concerns I went through your description. I suggest you not to worry much. Your family doctor is right. You have just a discoloration and should go after around a couple of years. The crown of penis is very much sensitive and ticklish. Your spot is harmless because you can feel the same ticklish feeling over the oval spot also. Doctor has examined it and confirmed it. Believe him. If not you could be led to obsessive thoughts about this. Leave the thought now. You can use coconut oil over the discoloration daily. Coconut oil brings skin tone back fast. Hope this answers your query. Available for further clarifications. Good luck.