Hi Thank you for asking HCM. I have gone through your query. Possibilties for your condition are allergic rash to some thing you exposed or hair bed infection. If allergic rash then it goes and come. In that case taking anti histamines like cetrizine ( zyrtec ) and applying hydrocortisone cream for local application will be helpful. But if it is on hair bed or it appeared after shaving hair then it can be most likely hair bed infection. In that case washing with warm water and applying povidone iodine or brilliant green will be helpful. Hope this may help you. Let me know if anything not clear. Thanks.