Young adult with oily/acne-prone skin here! I bought the TonyMoly Tea Tree mask & Lemon mask.
Tea tree: good mask that does reduce redness and acne! It also helps with my acne discoloration. This mask helps me have clearer looking skin and it has a nice refreshing scent and feels cool on the skin. I like to use it weekly, or whenever my skin is breaking out.
Lemon: makes my skin softer and brighter! I've only used the mask once so far, so I don't notice any huge change with my skin. However, I've read reviews where they say the true value of this mask becomes more apparent after multiple uses, so I look forward to it! Nice refreshing scent and feels cool on the skin. Will update the review after I've used the lemon mask a few more times. :)
UPDATE: I like the lemon mask a lot! It brightens my skin and gives it a soft glow. I use this mask when my skin looks a bit dull.
All in all, I would recommend the tea tree mask for those struggling with acne!