The human's skin consists of several layers, God supplied each layer with a definite structure that helps in protecting the human and sensation of heat and coolness. So the lower layer of the skin contains the nerves, blood passes in it and it is responsible of pain and sensation of heat.
On the day of resurrection, God will torture the disbelievers and burn their skins then he will create for them new skins to continue the punishment. God be he exalted says:
(Surely! Those who disbelieved in Our Ayât (proofs, evidence, verses, lessons, signs, revelations, etc.), We shall burn them in Fire. As often as their skins are roasted through, We shall change them for other skins that they may taste the punishment. Truly, Allâh is Ever Most) Powerful, All-Wise)
[Sûrat An-Nisâ’, verse: 56]
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By: Abduldaem Al-Kaheel