Really itchy rash on one side of face that was in the sun. What can I do to even out color and stop itch?
Depends. You should treat the symptoms with a mild topical steroid and see if that helps. If this is really one-sided then this may be a sun-sensitivity problem, meaning something other than a sunburn. The change in skin tone may even out with time. You should probably see your doctor.
Try.... ..An over-the-counter Hydrocortisone cream. If that doesn't work, you'll need to see a dermatologist. The color will even out by itself over time. Next time you go out in the sun, apply a good sunscreen lotion.
See a dermatologist. The best way is to see a dermatologist for evaluation, diagnosis and treatment.