Itching that's become inflamed and bumpy for a month needs an in-person look, since the genital area isn't something to guess on OTC. A gynaecologist can see you instead of a dermatologist if that feels more comfortable.
Next Steps
Please book an in-person visit rather than trying an ointment blind. Avoid scented soaps or wipes on the area until then.
Health Tips
If it spreads, starts oozing, or comes with fever, please get seen sooner.