White mark on nails is part of Shakun in Hindu astrology. It is considered good luck to see white mark on nails. These white marks come and disappear pretty quickly.
White mark on left hand thumb nail suggests desire fulfillment and on right hand thumb nail suggests new relationship.
White mark on left hand index finger nail is associated with good luck and on right hand index finger nail is associated with journey.
White mark on left hand middle finger nail is associated with new clothes and on right hand middle finger nail is associated with profit through vehicle or new vehicle.
White mark on left hand ring finger nail is associated with lottery or monetary gains and on right hand ring finger nail is associated with new job or award or victory.
White mark on left hand small or pinky finger nail is associated with marriage or fulfillment of love or sex and on right hand pinky finger or small finger nail is associated with desire fulfillment.