Why does the hair sometimes look like its growing 1-3 weeks after laser treatment?

Laser destroys hair roots, which are active at the time of treatment, but do not remove hair shafts instantly. Hair shafts in the treated hair follicles will fall out mostly in the first week after treatment, with all the treated hairs falling out within 2-3 weeks. It is normal that some hairs in the treated areas may not fall within 2-3 weeks. These will be treated in the next session. These hairs, which are being shed, will come out on their own. It is best not to shave the treated area or wash it with anything but mild soap and your bare hands (no washcloths or Body Washes) for 3-4 days after laser treatment. This might cause the skin to get irritated.