No adverse effects were reported. CONCLUSIONS. Topical metformin-loaded peel-off masks can be a promising, safe and effective treatment for melasma. Although applied only once weekly, metformin peel-off masks show comparable efficacy to previously reported daily usage formulations....
Later, the mask reel is moved and a second set of four masks is used. This allows the mask patterns to be changed for different devices being made, without having to open the deposition chamber. It also allows changing masks when the mask wears out (for example, by deposition material ...