Brown spots on the skin have two causes according to AgingSkinNet: excessive sun exposure and heredity. They often appear on the hands and face and resemble large freckles. Brown spots, also known as liver spots and age spots, are difficult to prevent when they are hereditary, but limiting sun exposure along with practicing certain skin care techniques can help.
Cleanse the discolored area twice a day with plain yogurt. Yogurt contains lactic acid, and according to the article "Cosmetics and Your Health," lactic acid claims to smooth roughness and lighten brown spots.
Use a paste of baking soda and water to scrub brown spots. The article "Healthy Aging" says that aging skin loses elasticity and oil glands, which contribute to dry, flaky skin and spots. Baking soda polishes the skin and removes any lingering dead skin cells that cause further darkness and roughness to brown spots.
Steep one chamomile tea bag in a 1/2 cup of boiling water to make it extremely strong. Allow it to cool completely. Chamomile tea is a natural bleaching agent.
Add 2 tbsp. of fresh lemon juice to the chamomile tea. Using a cotton ball, dab on brown spots twice a day. Lemon juice contains citric acid, a natural alpha hydroxy acid that smooths roughness and bleaches discolored areas. The vitamin C in lemon juice prevents further cell oxidation. Store solution in the refrigerator and discard after two weeks.
Drink at least 64 oz. of pure water everyday to flush out accumulated toxins from the body. This will help break up liver spots and prevent new ones from forming and old ones from getting worse.
Use whole milk yogurt for facial treatments. This helps moisturize the skin.
If brown spots become extremely dark and irregularly shaped, see a dermatologist to rule out a more serious skin problem.