The presence of sclerosis-inducing glycosaminoglycan in the skin was confirmed in an experimental skin sclerosis induced by a chemical compound. An experimental skin sclerosis was first produced in the mouse with bis(4-amino-3-methylcyclohexyl)methane. Out of glycosaminoglycans isolated from the slightly changed skin of this experimental skin sclerosis, the one having a heparan sulfate-like structure was able to again induce sclerotic skin changes in another mouse. The chemical composition of this sclerosis-inducing glycosaminoglycan was somewhat similar to that of the scleroderma-inducing glycosaminoglycan isolated previously from the urine of patients with systemic scleroderma.