Thank you for your query at DoctorSpring.com.
I understand your concern. From you history, it does not seem to be Herpes. Lesions in Herpes usually develop as painful papules progressing on to clusters of fluid filled blisters on a reddish base which are also painful. Even in mild cases of Herpes, a mild pain or discomfort is present. Although Herpes can be transmitted through skin to skin contact with an infected person, your lesion is unlikely to be Herpes. I do know that reading online about medical conditions can be confusing especially with all the unverified and un-reviewed information.
Pain is an important characteristic of Herpes lesions and the absence of even mild discomfort along with the lesions which do not appear like Herpes, is what goes against a diagnosis of Herpes. What you have had could be a bacterial infection such as folliculitis or a fungal infection. Since you have a history of itch and profuse sweating, a fungal infection is more likely. A high resolution image of the affected area when the bump was present can be helpful in aiding diagnosis. So I request you to kindly upload one if it is available. If not, you could also upload a picture of the lesion at present.
Meanwhile it is important that the area is kept clean and dry and a cotton underwear be used.
Feel free to ask queries.