I NEED HELP ):

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the black point, it is from my birth, I am talking about the red color under the head of the penis. It seemed to happen about 5 months ago. For information, I practice masturbation with soap or without lubricants. My underwear is not completely cotton. Do you think this is one of the reasons? and the penis become less senstive

Why have you posted another Forum Post:
if you want to do anything about this here is the best I can specify to you …
It is almost certain that the main source of problems for your penile skin is the application of soap and other forms of body cleansers such as shower gel.
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For masturbation get yourself some Liquid Coconut Oil that is for use on skin rather than hair, apply a very light coating to the upper-shaft and head of your penis.
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Do you penis a real favour and never apply soap to it, wash with water only from now on for the rest of your life !