If you approach them while holding burning tansymum, they become aggressive and attack. When holding burning lavender, they flee from you instead. The diseased kebbit fur that these kebbits drop can be used to make a Davy kebbit hat by talking to Frawd in Oo'glog. Diseased kebbits are part of the As a First Resort quest, where players must get rid of them to make way for a new spa resort.