108 Sashti fasting is a nine-year Muruga Sashti Fasting. The fasting is observed on 108 Sashti (sixth day during the waxing phase of moon) days. The fasting begins on the Sashti day in Karthigai or Aippasi Masam in Tamil Calendars. This is the famous Skanda Sashti after Deepavali.
108 Sashti fasting should be observed without a break. It can be observed during monthly periods – women avoid performing puja during this period.
The offerings that are made in each year vary from region to region.
In some regions milk payasam (milk kheer) is offered in the first year, jaggery payasam in second year, third year it is white rice, fourth year it is appam, fifth year it is kozhukattai or modakam, sixth year it is cow milk, seventh year it is coconut water, eighth year it is Panakam or sweet drink and ninth year it is pepper that is offered.
It is believed that observing 108 Sashti fasting will help in attaining peace and prosperity. It is also widely observed by those people having Chowa Dosham and other marriage problems.