Lemon juice for removing hyperpigmentation caused by acne. i read comments about using this and they say its good but too acidic. is it effective?

No: Postinflammatory pigmentation will fade naturally but may take up a few years. I hope you are presently being treated for acne; it can be managed effectively by ur physician. There's little to do for the little spots; a depigmenting agent is difficult to use and may end up causing more of a mess than it's worth. Enjoy life and the challenges of youth and be reassured that most people don't notice.