What you're experiencing is razor burn or razor bumps. To keep this from happening is to soak your skin in a hot bath to soften the hair follicles. Use a shaving creme or lotion made for sensitive skin and a new blade (used less than six times). Don't pass over the same area of the skin more than twice. Follow up with a sensitive skin lotion and lightly exfoliate during the following times you bath to keep ingrown hairs from developing. Try to avoid shaving more than every other day.
Hello,
It can be due to razor bumps. After shaving, apply cold compresses(ice cubes wrapped in a towel) on the rash and take some antihistaminic like Benadryl or claritin. You can also apply calamine lotion on the rash. It will help in soothing the skin. A mild corticosteroid cream like dermacort will also help.
Also you can go in for laser hair removal which causes permanent reduction of hair and does not cause folliculitis also. Please consult a good cosmetologist/dermatologist for that.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.