I think you may have a bacterial infection (impetigo), though it may just be folliculitis. Herpes seems much less likely. You really ought to see a doctor--a walk-in clinic would be fine if that's all you can access on short notice. Bacterial infections may need antibiotics, and you could use a definitive diagnosis in any case. (You don't have to catch bacteria, by the way--they live on the skin sometimes and congregate where there's sweat and trauma.
Not to worry--just get it looked at and treated. Meantime, apply bacitracin or neosporin.
Take care.
Dr. Rockoff