For the past couple weeks, i have had an itchy pubic hair area. it gets worse when im wearing underwear. it gets red but there are no raised bumps. it itches like ive shaved but i havent shaved recently. what could this be?

Few things: From an allergy to a fungal infection among the most common possible causes. Would suggest wearing loose, cotton underwear for a while as it sounds clearly related as far as location and behavior. If rash and symptoms persist have your doc take a look at rash when active. Do not use any creams or ointments for now, try to keep area as dry as possible.