Thiruchendur is the holy place of lord Muruga. It gives the spiritual knowledge to demon Surapadma during Sura Samhaaram and changed him in peacock and cock flag and keep it with him his face was in a very beautiful form that attracts the devotees and lord Murugan has a flower in his hand which shows a beautiful form that after finishing the problems created by demon surapadma he did a Shiva pooja for doing a sinful activity( finishing up the problems created by demon suran and changed him as a residing peacock and a rooster) and before war with suran he is doing Shiva pooja for victory that time God pleased lord Muruga to show you beautiful form to the devotees as it is that is why he has a flower in his hand