I've been using this for a while now so feel ready to give my honest review. For reference I'm 28 have pigmentation and melasma on my body, I had terrible acne which cleared up after using a prescription retinoid. I started using the mask to try and get a brighter complection and whilst I must admit, I did notice my skin looking brighter I also noticed my pigmentation getting worse leaving me with darker patches. I have to add that the dark patches were NOT caused by the mask, I already had them but the mask seemed to highlight it more I suppose. After using the mask and noticing this, I cut down my usage from 5 days a week 10min slots to 2 times a week 10mins and this is where I noticed more of a balance. The melasma and pigmentation is under control but I still get to benefit from glowy skin. I will proceed with caution but wish I could use it more often.
By the way this on my head has been amazing, I noticed baby hairs around my forehead growing when I was using it on my face so decided to try it on my head and yep, it grows hair! Might need to invest in the head helmet version this works but doesn't sit right.
I would recommend but proceed with caution if you have melasma or pigmentation