Hi there jelan. If the cream has done its job, then good for your mum! She can stop now without any problems. However, it is adviseable to use a good quality sunscreen from dawn to dusk right away & to continue that to keep the advantages going. Also, it will help her in the long run to look radiant & younger. It is always adviseable though, to visit a skin specialist nearest you or you are more than welcome to come across to Bangalore for a hands-on opinion in such matters of pigmentation as these have to be assessed. Cheers & Good Luck to both you & your mother!
Dr Praveen Rodrigues MDS
, Cosmetologist, Venereologist
Vikram Hospital & Asian Skin Institute