You are right on the money, SDP, as usual. Just to clarify (as a herpes sufferer)... Herpes generally appears as small blisters (or occasionally small slits that look like paper cuts), red with a whitish head and red irritated skin around the blister itself. They can be itchy but generally are just extremely painful. I've never heard of a case of herpes that presented itself as large purple lesions, but I of course don't presume to know everything.