Sorry, can't tell from a description. It sounds like an irritation to me. The peroxide may well have aggravated the irritation and should not be repeated. I suggest you see a doctor ASAP (not because it's an emergency, but because the doctor will only be able to tell what it is if the spot is fresh. If that can't be arranged, take a good photo and bring it along to your appointment. Meantime, just gentle cleansing please.
Take care.
Dr. Rockoff