I realize this answer is very, very late ...
I couldn't find any information on Resodin so can't really comment on whether it can be used in place of Bioquin.
Bioquin is hydroquinone. It is used for lightening freckles, age spots, and other skin discolorations associated with pregnancy, skin trauma, birth control pills, or hormone replacement therapy. It may also be used for other conditions as determined by your doctor.
Hydroquinone Cream is a skin-bleaching agent. It works by inhibiting an enzyme reaction in skin cells.
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