Lord Shiva in the temple is a swayambumurthy. The special feature of the temple is that abishek to Lord is offered with ghee followed by hot water abishek.This temple is one of Paadal Petra Sthalam.
Neyyadiappar Temple Thiruneithanam
A cow in this region was habitually pouring its milk at a specific place. The milk impacted by Sun heat and rain changed into ghee. When a shepherd tried to check the cow, it disappeared. He could not know that it was the very divine cow Kamadenu. When people came to the spot and dug the place, they found a Shivalinga here. The news reached the King. He built a temple, performed consecration and arranged abishek with ghee each day. The ghee abishek is followed even now. Ghee means Nei in Tamil, hence the name of the Lord Neiyadi Appar. The place has another story too. A Shiva devotee had the habit of picking the palak leaves while returning after lighting lamps in the temple. He told Lord one day that he was lighting lamps in the temple each day and sought his mercy as he was aging. Lord replied that what mercy remains to be shown to him as he had taken the Palak leaves grown in the temple as wage for the job, according to sthala purana.