Kaarthigai Deepam is a festival of lights, celebrated in the Tamil month of Kaarthigai. It is celebrated on the full moon day of the Kaarthigai month which coincides with Krithikai star.It is also considered as the extension of the Deepavali festival. In some houses, they double the number of lamps every day from the day of Deepavali and this way, they end up with a number of lamps on the day of Kaarthigai Deepam. It is celebrated in a special manner in Thiruvannamalai for Lord Shiva.Lord Muruga took the form of six babies in a lake called "Saravana Poigai". On this day, all his six forms were united by Parvathi(his mother) and this way, he had six faces. Special poojas are performed to Lord Muruga on this occasion.