I Am An African American 31 Year Old Female With

I am an African American 31 year old female with dark skin. My question is regarding lemon juice and apple cider vinegar for acne and toning. Lemon juice has cleared up my skin to some degree, but I worry about long turn effects. One Dr. stated that this is only recommended for Caucasian skin types. Should I worry about damage if I continue using lemon juice?