-Use a product that has salicylic acid and exfoliate the area daily. Just make sure you don't scrub. OUCH!
-Aloe vera and/or tea tree oil can be very soothing and is a nice natural alternative.
-Do not shave until the area completely heals.
I really like The Art Of Shaving Womens Ingrown Hair Night Cream when I get razor burn.
As far as men go: this one is bestselling on most major skin care websites: Princereigns Ingrown Hair Serum