I was told to do nothing to my IPL burn / blister. Is this right?

You can apply Neosporin or Aquaphor to the area, try and keep it moist and stay away from the sun until healed

I recommend applying lots of Aquaphor to the area and staying away from the sun!If its not healing make sure you seek appropriate medical care

I tell people not to poke or pop a blister from IPL, but it's absolutely necessary to keep it very moist, and out of the sun. Also, sometimes a topical prescription like Betamethasone Ointment will help. In your case, I would absolutely have recommended Betamethasone immediately. That burn is significant and will require diligent care, as well as possible post treatment concerns of hyper or hypo pigmentation. Seek the care of an experienced physician as soon as possible. "This answer has been solicited without seeing this patient and cannot
be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."