Your son seems to have developed superficial skin burns due to the laser treatment
that he is on.
This is not a bad sign at all.
It is a simply a side effect of the laser treatment.
I would advise you to take proper local treatment of the area.
You should keep the affected area clean and dry.
Apply a topical antibiotic
cream over it twice a day.
You might need oral antihistamines to bring down the surrounding redness
Dr Geetika Paul