Kankar Mata is closely associated with Shitala Devi and is worshipped in this form mainly in parts of Bihar, Jharkhand and Bengal. She is mother goddess to many people. She is counted among Saptamatrikas in certain regions.
There is a widespread belief that it is her anger that results in contagious diseases. She is propitiated to ward off diseases and for peace and prosperity.
The seventh and eighth day of a fortnight – saptami and ashtami – are dedicated to her especially in the months of Chaitra, Baishakh, Jyeshta, Ashada and Shravan.