Since you have not had sex, and they are not in the vaginal area, it may be due to infected follicles. Which can occur due to irritation, of possibly wearing a pad, or clothing, plus with it being hot, these area's sweat and become moist. Keep the area clean with antibacterial soap. Try to wear loose clothing, along with cotton panties as this will allow the area to breath better. If you do an activity where you may be sweating, wash with the antibacterial soap as soon as you can. Also make sure the area is dry prior to getting dressed. So at this point, unless the spread further or you develop other symptoms, it doesn't appear to be anything serious.
Hope this helps, If you need anything else please feel free to ask. If you found this helpful don’t forget to click the *
Accept* button.