His throat is blue due to the fact he had drunk poison, which erupted from The ocean in the course of Samudra Manthan (churning of the ocean). Consequently, he generally wears a cobra all-around his neck to mitigate the effects in the poison. The title Neelkantha (1 who has a https://billl877frc0.bloggazza.com/28607432/shiv-fundamentals-explained