Sitz bath is the name given to a process of treatment for conditions like piles, cracks in anus, and other 'regional' ailments like after the delivery of a baby etc. It is done by pouring warm water in a wide bowl, adding bit of potassium permanganate in it and sitting in the bowl for 10-15 min three times a day. It can relieve pain and inflammation in the area. You cannot buy sitz bath...you can buy the components and make it at home.