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They could be insect bites. I wonder if you may have been scratching some of them? Get some insect bite or Savlon cream to soothe the areas and they should settle down.
Adhari
you should probably go to a sex clinic, like Adhari said, might be insects bites, it could also be scabies, or even siphilis (treatable with one injection), you should go and get tested just to be safe.