I received IPL today at a skin clinic. I now have red blocks/stripes on my arm. Is this normal? (photos)

Today I opted to have IPL on my arm to treat a one year old scar. I had a patch test 3 weeks ago and everything went well. Today when I went in for my treatment, my arm became very hot and red (not just the initial "rubber band snapping" sensation). It has now been one hour since my treatment and I've developed red "blocks" or "stripes" on the treatment site. Is this normal? My clinician simply told me to put aloe vera gel and ice on it and stay out of the sun.