I had acne for a long time and my face has got darker since then I wanted to know would my face go back to the original color if my acne goes away

I guess it also depends on what you are using on your face currently. From what I have been reading, you want to cleanse, then exfoliate, then moisturize your skin, then apply whatever it is you are using to lighten your face. Not all the same things work for everyone, but some of the brightening gels do clear up acne and should bring you to the tone you were. More of a trial and error to find what works for you.