3 sessions of Soprano Platinum 2018 did not work on my underarms, advice?

Thanks for your question.  With our Vectus laser, we recommend at least 6 sessions for 90-95% reduction.  After 3 sessions, your should start noticing thinning.  Not all LHR devices or providers are the same.  Much of your LHR results are dependent on the maintenance of the laser and competency of the technician.  It could be the handpiece is dirty or they are using the wrong settings.To be safe, you should seek out a laser vs. IPL to help avoid complications.  Almost all newer lasers are safe for all skin types and have features built in (such as sapphire cooling tips) to make them more comfortable.  Some of the newer technology is also more efficient, allowing for lower energy settings to be used with better results and less discomfort.  With modern equipment, your treatment should only be mildly uncomfortable, but not painful.  We never use numbing cream for LHR.  We want our patients to be able to tell us if they feel pain or an unusual level of discomfort.We recommend finding an experienced and reputable provider in your area with updated equipment.  A consistent overlapping technique is the key to avoiding patchiness in LHR.   Calibration and power of the laser is important for a safe, comfortable and effective treatment.  Find out what laser they will use and if it is under a maintenance contract.  If their laser isn’t calibrated on a regular basis or is underpowered, your treatment may be painful or inefficient. After a series of 6-8 initial treatments, you may need a touch up every 3-5 years.  I hope this helps.