yes, but you might already know this but you don’t want to use hydroquine long term. A few months is okay but not forever.
Some notice Vitamin k works well on dark circles.
Yea its probably not a great idea to use a lot of it long term due to the carcinogen concerns. Im not super well versed in that but it does work for focal areas that you wanna decrease melanin production. Its commonly used in other countries not just in facial cream but for body long creams and treatments and i can imagine there is increased risks when used over such large areas for longer periods of time.
With that said im not aware of studies showing significant issues...there may very well be some as its not something ive looked into too much. But the potential risk of issues is enough for me to suggest not using it for your entire body or long term in a particular area. As you mentioned a few months is ok