Bikini area got dark after diode laser hair removal?

I have fair skin and black coarse curly hair. My bikini area Had ingrown hairs because of shaving. After my first session of laser, the area was red. This was IPL but I then switched to diode laser. My skin was still red by that time and when i finished a second session, a few days later it started to itch so i would scratch it. Then it got more red and after a few days it turned darker? Whats going on and what can I use to make it go away? How do i prevent this in future? Should i stop laser?

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