去掉因濕疹痊愈後引起的皮膚上深色的疤痕辦法,----用美白產品? Hydroquinone

我剛看過醫生,建議用含有皮膚色素合成的抑製劑 Hydroquinone 的軟羔對苯二酚， 有致癌作用

Hydroquinone is extremely dangerous and may lead to the development of cancer. It has already been banned in countries like the U.K. and France, 

哪位知道最少用多久沒效就可停藥?