Burn mark from BBL. What could this be? (Photo)

It is very important to for you, as well as other readers of this answer, to know that we have long known (in fact since the late 1980s) that there is an ideal and optimal window of time to treat incipient post-treatment scars and discolorations that ranges from the end of week four after the treatment to the end of week twelve. Scars older than twelve weeks are considered "mature" and are much less likely to be significantly minimized or "ereased." You would be wise to keep this window of opportunity in mind and to seek consultation with a board certified cosmetic dermatologist. If a scar or dyspigmentation issue is determined and treated during that window of opportunity, potential scarring and/or prolonged/permanent dyspigmentation can potentially be avoided altogether or minimized significantly. Hope this helps and best of luck.