Dhanwantri is considered to be the doctor of all gods with the total knowledge of Ayurvedic medicine. He was born on Dhan Trayodashi. It is common practice in Hinduism to pray to Dhanvantari on this day for seeking his blessings for a sound health.
Prior to starting the puja, 13 lamps are lit. While after the puja, a big clay lamp is lit and placed at the entrance of the house facing south. Some coins are also put into the lamp that is big enough to last the whole night.