Vanquish left a blister that burst and now I have a scar with hyperpigmentation about the size of a quarter. Help! (Photo)

Vanquish rarely can cause blisters like the one you experienced. Normally with time the scar will improve considerably but might take 6-18 months- A fractional lasler could help speed improvement of the scar- sometimes a bit of moisture will accumulate on the skin during treatment and that will cause localized heating and the blister

Hi Chant82, Thank you for your question. Since the Vanquish treatment uses heat there is always a risk of skin irritation. Most technicians should check on you regularly and keep a fan pointed at the treatment area to keep sweat from building up and reduce discomfort "Hot spots". If it occurs again with future treatments I would reach out to the clinic where you had the service done to let them know so they can bring you in to evaluate and treat the area. As far as the pigmentation is concerned it looks like PIH or Post Inflammatory Hyperpigmentation, which usually lightens over a several months. To speed up the process a lightening cream such as Hydroquinone can be applied to the area.Best of Luck