What Causes White Spots Inside Palm Of My Hand?

HELLO DOCTOR , FROM PAST A MONTH I AM SUFFERING FROM WHITE SPOTS INSIDE PALM OF MY HAND I , DON'T KNOW EXACTLY WHAT IS THIS ? I WENT TO A SKIN SPECIALIST HE TOLD ME NOTHING IS THERE ITS JUST AN INFECTION OF CEMENT BECAUSE I, WORK IN CONSTRUCTION FIELD HE TOLD ME IT WILL GO AWAY !! HE PRESCRIBED ME WITH SOME MEDICINES AND I COMPLETELY FOLLOWED THEM BUT NOTHING RECOVERED SUGGEST ME WHAT TO DO