I've read on this site that HQ 4% is still the most proven method for lightening along with some form of Retin A. Could alpha arbutin be used in lieu of HQ? Also, I seem to recall getting white (tiny) spots on my skin when I used HQ. Many African Americans that I know who use HQ experience this problem - is there anything to combat this spotting? The spots have disappeared since I stopped using HQ. TIA.