It sounds like you are most likely dealing with infections of the hair shafts, called folliculitis. This is very common in sensitive skin areas, especially in areas where chafing and moisture predispose the skin to infection. It is also worsened by shaving, so if you shave in this area that may be a contributing factor.
Folliculitis occurs when bacteria get into the base of the hair shafts and cause infection. The symptoms include raised, red areas that can be painful at the base of the shafts. Sometimes, the folliculitis can be controlled simply with good hygiene and keeping the skin dry. If this doesn't work you may want to try an antibacterial wash, including something containing benzoyl peroxide (commonly used for acne
Occasionally, the folliculitis cannot be kept under control with these measure, and you will have to talk to your primary care doctor
, who may recommend topical or oral antibiotics.
Rarely, the infection associated with the folliculitis can worsen. Therefore, if you notice spreading areas of red, warm, painful skin, or if you notice areas that are swollen and appear full of pus, or if you have fever
, these are more concerning signs and you should seek immediate medical care.