<s>[INST] my male sharpei who is about 14 years old has a very strange rash growing on his back legs. it not necessarily near the genitals. the rash is on both back legs and spreads down to his feet . it is black and scabby. feels like leather and has been spreading, slowly at first but now more rapid. it is not on his belly, but is now slowing appearing on his front legs as well. what is this and how can i treat it? [/INST] Hi, Your sharpie would be having either allergic or irritant contact dermatitis. Or it would be some chronic relapsing disease like lichen plans or psoriasis. For actual diagnosis, he should consult to dermatologist. After complete diagnosis, proper treatment may be given. Local steroids with antibiotic cream may be encountered. Oral steroids in tampering dose may be helpful. Avoidance of contact with dust, soap, grass.etc. may be helpful. I hope you got my answer. Thanks. </s>