I can see that you are online, so i am posting my answer.
Well, from the description it sounds to be Folliculitis.
It arise from Hair follicles and sebaceous (sweat) glands and occur due to the fact that hair follicles become infected, often with Staphylococcus aureus.
It is not related with STD or any other serious issue.
Yes, rough sex, can lead to such bump. This is not related with STD. Don't worry.
No need to get panic.
You can apply a warm, moist washcloth or compress to the affected area 4-5 times a day to relieve discomfort and help the area drain.
You can try over-the-counter hydrocortisone cream to affected area.
You should gently wash the infected skin twice a day with antibacterial soap or apply an over-the-counter antibiotic ointment.
You can use a clean washcloth and towel to dry off each time you wash.
Usually such symptoms will get resolve in a week by these tips.
Hope this helped
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