Dark spots and burns after using Lumenis LightSheer on legs. Wedding in three weeks! Any advice would be appreciated. (Photo)

I would notify the practicioner who did your treatment and let them know what happened so they can address it with you.  It's best to wait 3-4 weeks after sun exposure to have a laser hair removal treatment done.  I would keep using aquaphor to help keep a barrier over your burns and keep an SPF on your legs.  It should even out over time but it will take a little while.

Unfortunately, there is not a lot you can do for the hyperpigmentation that you are not already doing. With time the spots will disappear, but it probably won't be completely gone in 3 weeks. The most important thing to do from now on is do not tan while you are having laser treatments. Tanning causes damage to your skin and makes hyperpigmenting more likely. Best regards.

Thank you for your question. Keep doing everything you are currently doing to heal the area. No more tanning, if you tan during this time while the skin is healing you could cause permanent pigmentation problems, avoid sun exposure and keep plenty of SPF on once the burns are healed. Unfortunatley there is no quick fix to this kind of complication, in 3 weeks from now the pigment should have mostly faded. You can talk with you provider about hydroquinone to help even out the pigmented areas. It can take up to a year for the area to fully recover so make sure you keep that in mindwhile you are in the sun this summer and next. Best Wishes,Pablo Prichard