There are many reasons behind dark and black spots over the skin layer. Some people suffer from excessive secretion of melanin
over the skin layer, whereas another group of people suffers from the same due to excess exposure to sunlight.
I would like to suggest you to take the lemon juice and apply to the dark spots, black spots. The Vitamin C in lemon juice works as the antioxidant on the skin and remove the impurities on the skin. The lemon has the capacity to lighten the dark spots. Dip the cotton ball in the lemon juice and rub the area of dark spots and black spots. If anyone has the sensitive skin, then dilute the lemon juice with water
. Use this until you get the desired result. There are many usefull medicine in Ayurveda
for Black Spots. You may consult me on Lybrate.