What Do Non-itchy And Painless White Spots Around Penis Indicate?

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sir, iam 22years old man . my penis have small white pimples on the rim of the head of penis. it scatterd as roundly on the rim . it does not causes itching and pain . its affect me since last 7 years. due to my shy i never approach a docter at that time. now i saw a doctor but he could not help me . so kindly help me sir . i very worried cause to this. i expect your reply.