Although skin whitening and depigmentation are primary uses of aloe vera, and many of us use it to cure sunburn and get rid of skin tan, you need to be cautious about when you use it.
Aloe vera can highly reduce the tan and make your skin appear fair, but if you apply fresh aloe vera juice and go out in the sun without removing it, it can have a reverse effect on your skin.
If you do not wear sunscreen and leave the fresh aloe vera gel on your face while you are out in the sun, the aloe vera gel absorbs more UV rays from the sun, which may speed up the melanin production of your skin and, in turn, cause darkness.
If you use aloe vera when you come back from being out in the sun, it helps to reduce the melanin content and give you a fairer tone. That is why you need to be careful when to use it.