I have had ovarian cyst whch was removed.and. had androgen imbalance too.i have neither nw ...what should i do for facial n chest hair?

Depends on the cause: Unwanted facial hair can have many causes. Birth control pills can do it, as can medical conditions that alter hormone levels, such as polycystic ovaries. If you are taking bcps ask your doctor about changing to another brand; if not, ask about testing to rule out internal medical conditions other than those you've already ruled out.