Thanks for writing.
Without knowing your medical history or background it’s hard to give specific information, but I can give some general information.
There are some causes of sores that are normal, such as scrapes that happen during sex or masturbation, or inflamed hair follicles. These usually go away on their own.
Other sores can be can caused by STIs such as the herpes simplex virus or Syphilis.
You could see your family doctor or go to an STI clinic. They would be able to do a physical exam and testing to see if it is anything to be concerned about. Have a look at our clinic finder for a STI clinic in your area.
Feel free to leave a comment below if you need more clarification.