For the past couple weeks, I have had an itchy pubic hair area. It gets worse when I’m wearing underwear. It gets red but there are no raised bumps. It itches like I’ve shaved but I haven’t 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.