Why do i have white itchy bumps after my first diode laser hair removal treatment? (photos)

I've just received my first laser hair removal session Friday. The next day he said I could shave. So I did. All was well in the morning but as the day went on my legs started to burn and itch so bad. I applied cold water to it because that was the only thing that could take away the pain and itching. I did not scratch them because I fear I'll scar. Today is Sunday and now they look like the pictures I've just posted.