Arrangement for treating skin diseases using kangal fish comprises a spa bath (10), a cleaning station (11), a device for directing the fish from the cleaning station into the bath, and a device for directing the fish from the bath into the cleaning station. The cleaning station provides water at a temperature of 20-35, preferably 25-32[deg] C. Preferred Features: The cleaning system uses flowing water. The bath is equipped with a self-cleaning system. The device for directing the fish from the cleaning station into the bath is a basket (16) with a number of holes in a side wall or a connecting channel. The device for directing the fish from the bath into the cleaning station is a basket that can be lowered into the base of the bath.
