Hi, you are having
hypermelanosis on dorsa of hands due to
tanning effects of sun.It is not a disease. You avoid excessive sun exposure. Keep the hands covered with cloths , and apply the sunscreen gel repeatedly every 4 hours during the day time. Rub the
kojic acid and
vitamin C containing cream lightly at night. Wash the hands with kojic acid containing soap.Remember, never scrub or heavily scratch the hand's skin.. Otherwise the conditition will worsen... I hope you will improve after following my advice...ok