The story of Lord Kartikeya’s birth is given in Kumar Sambhavam.Sati, the consort of Shiva immolated herself at the site of the Daksha Yagna, which was later destroyed by Shiva. Sati was reborn as Uma, or Parvati the daughter of the mountain king Himavaan (the Himalayas). Shiva withdrew himself from the universe and engaged himself in yogic meditation in the Himalayas.
Kartikeya is also known as Subramaniam, Skanda, Guha, Shadannana or Shanmukha (because he has six faces). He represents a person of perfection. He is the war God, the Hindu equivalent of Mars and Aries. He was created by all the Gods to lead the heavenly hosts and destroy the demons. He is the most masculine and fierce of all the Gods. While Ganesh removes all obstacles, Skanda bestows all spiritual powers, particularly the power of knowledge.
He is worshiped for all problems related to Mars, especially Mangala dosha or Kuja dosha.