I wish there was more standardization to diagnosis of EM. It is usually diagnosed by the red appearance, the heat and pain. It has been treated by Dermatologists, cardiologists, endocrinologists, neurologists, pain docs, etc. EM can be a genetic disorder, as well as be secondary to another disease or injury process. Genetic studies, lab work looking for abnormal or almost abnormal values in blood structures and vitamins/minerals. MRI looking at neurologic function, CT, nerve function studies, endocrinology labs