Dermitolody: i am female of age 22.what should i do to get rid of white paches on my back?

White Patches: Pityriasis alba is a common skin disorder similar to very mild eczema. Causes the cause is unknown but associated with eczema. The disorder is most common in children and adolescents -- particularly in children with dark skin. Symptoms round or oval patches of skin appear on the face, upper arms, neck, and upper middle of the body. There may be flaky skin, called scales. Treatment is with elidel (pimecrolimus).

Without seeing I: can't be sure. But commonly tinea versicolor is seen to cause white spots on back. But there are other causes of white spots on skin. See dermatologist for correct diagnosis and treatment options