If you apply Aloe Vera 3 hours a day, will it lighten the flat mole on your face? (Photo)

I do not believe that aloe vera would have any effect on lightening the color of a mole.  There are other treatments that could be effective in treating the flat mole on your face though.  I would consult with a facial plastic surgeon, plastic surgeon or dermatologist to discuss treatment options. 

I recommend getting an in-person formal evaluation with a board-certified cosmetic dermatologist. Moles can be removed with a laser, radiowave or shave. If there is any scarring or pigmentation following the removal, your dermatologist can treat those conditions as well. See an expert. Best, Dr. Emer

Aloe is great stuff and perfect for a sunburn.  That's why every hotel in Aruba grows it -- so you can just pick a leaf and use it.  I do not believe it has any lightening qualities.   I suggest you see a dermatologist and have your mole evaluated.  If you don't like it, there are ways to remove it with minimal scarring.