What is the wisdom behind the clear appearance of the word "Allah" in the veins on the palm of the right hand, and what should be done about it?

We have nothing concerning the matter mentioned, but the entire universe consists of signs indicating the Oneness of Allah. The purpose of blessings and signs is for the servant to submit to his Lord and remain steadfast in His command, as Allah Almighty said: "Thus He completes His favor upon you that you might submit [to Him]." (An-Nahl: 81). Our duty is to recognize divine commands, submit to them, and remain steadfast in obedience until we meet Allah while He is pleased with us.