Redness and itchy skin after laser hair removal? (photos)

I have done the laser hair removal on my back. I the last sessions that I did the laser it became red and itchy and also discomfort. I am writing to ask for your help and advise what is the cause and does it go away and what sort of treatment is helpful to get rid of redness and avoid the change of skin color. I have attached a photo here under for your review and advise.