Because visual inspection cannot reliably distinguish certain shin discolorations from skin cancer, dermatologists at clinics have needed to perform tests of skin tissue taken form patients. At Westville Hospital, dermatological diagnostic costs were reduced by the purchase of a new imaging machine that diagnoses skin cancer in such cases as reliably an the tissue test do. Consequently, even though the machine is expensive, a dermatological clinic in Westville is considering buying one to reduce diagnostic costs