Can Hydrogen Peroxide be used to lighten skin imperfections?
yes, but you would have to sitten in the SUN ALL DAY.
To use hydrogen peroxide to remove dark spots on your skin, you will have to buy hydrogen peroxide that is sold in your local beauty supply store. Apply it to the dark spots and let it sit for several minutes. No more than ten. Rinse it off and over the course of a few days, the spots should lighten.
Though the chemical reactions with other elements is in doubt not known to me ,since I'm not a chemist,Hydrogen Peroxide kills healthy skin cells of the epidermis and germs when pouring it to a cut as usual first-aid procedures . But that is all I know, I tested this by pouring hydrogen peroxide on my skin without an open wound and resulted with dead cells on a section of my epidrmis (skin).
Pure hydrogen peroxide certainly can cause chemical burns if it touches your skin. Hydrogen peroxide you buy from a drugstore is typically about 3% hydrogen peroxide and 97% water. As far as your skin is concerned, as long as you're not actually bathing in it it's not all that different from 100% water. You should be careful with even the dilute stuff around your eyes and mouth though; the mucous membranes are much more sensitive.