Why was my bikini area red and itchy after laser hair removal? How do i get rid of the brown patch on my skin??

I have fair skin and black coarse curly hair. My bikini area was full of ingrown hairs because of shaving. After my first session of laser, the area was red. when the second session was over, a few days later it started to itch very bad so i started to scratch it. Then it got even more red and within a couple of days it turned darker? Turned brown! What is going on and what can I use to make the brown go away? How do i prevent this in the future? Do i stop laser?

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