I have uneven skin tone. please suggest an unharmful product to lighten skin tone on the face. ?

Mainly sunscreens: Normal people have whatever skin colors nature gives them, which ranges from very light to very dark. That means normal people don't need to get a lighter color. If a person doesn't want to darken due to sun exposure, the best cream is a facial skin moisturizer with sunscreen inside it. Avoiding sunlight will keep skin lighter, but one will need to take extra vitamin D if avoiding sunlight.