Had one of those brown spots square on my forehead. Hawaii... I know exactly when it popped up and why. Tanning bed and the beach. I got this kit to fry off my deep residual cystic acne pocks. One day I was starring at that gastly brown island on my forehead and said to heck with it. I carefully applied the tca to only the brown spot. Told the then future hubby what trouble I might of gotten up to. (spot was almost 1/4 inch wide). He was unimpressed. "uh huh ok babe". Maybe 5 days later i am starring at the state of main again on my face...looks nastier and browner...I look closer and poke at it a bit with my finger....the nasty little age flaked spot right off. Gross thing was like the size of a corn flake. Anyway.... Against jules always awesome advice I later fried the state of CT off my chest. Be careful with this golden priceless wonder juice, it is strong like other reviewer states. Respect the TCA cross kit.