Does Stretching Of Skin Due To Weight Gain Lead To Tanning Of Skin?

So, I know this sounds dumb... but when i was younger i had tan skin. I then started gaining weight and my skin got paler. Now, I have lost weight and my skin is looking tanner. I am not in the sun or anything. So my question is does it have anything to do with the stretching of my skin or loss of melanin?