Can peeling skin on palms and hands caused by excessive expose/use hydrogen peroxide (bleach) be reversed/healed? my hand's skin has become thinned, tight, paper-like and crack bleed easily. will my hand skin become thick as before again?

Hydrogen peroxide is not bleach but prolonged exposure can bleach the skin. Excessive exposure is corrosive to skin. Breathing its vapors is also irritating to the respiratory tract. I suspect your exposure was to the lesser strength of hydrogen peroxide. Cracking and thinning of your hand skin should heal in time. You could consult a dermatologist or a wound specialist for evaluation and advice.