Herpes Simplex Or Febrilis is well known to be excited, probably reflexly, about the muco-cutaneous orifices chiefly by a multitude of recurrent causes, such as the catamenia, sexual congress, febrile movement in colds, pneumonia, etc., and often without obvious cause. Herpes zoster, on the other hand, is caused by an inflammation of the nerve ganglia, and this may be set up by traumatism, or the ingestion of arsenic, but usually, it is thought, by a special infection. These eruptions do not call for special dieting.