As per the Kanda Puranam, once all sages and gods assembled in Kailash to witness the wedding of Shiva with Parvathi. It resulted in the tilting of earth towards one direction. Shiva asked sage Agasthya to move towards South to balance the tilt. Agastya employed a demon by name Ettumba to carry two hills in his shoulders to be placed in the South. The demon carried the hills down south and rested in a place. When he tried to lift one of the hills, it didn't budge and he found a young man standing at the top of the hill not allowing it to be moved. The demon tried to attack the young man, but was smitten. Sage Agastya identified the young man as Karthikeya and asked him to pardon the demon. Karthikeya readily did so and let the hill remain there at Pazhani. It is a practice followed in the modern times where people carry milk in both their shoulders as a devotion to please Karthikeya. The demon carried the other hill to Swamimalai.