They do it that way here too (I had a venous doppler because I had persistant pain behind my knee)...they told me before I left that there was no sign of a clot.
There are other possible things that could be detected but that wouldn't be reason to admit to a hospital would be, ie.. venous insufficiency (valves in the veins that don't work properly and can predispose to swelling, varicose veins, etc...)
Also, the "rash" sounds like stasis dermatitis.
http://en.wikipedia.org/wiki/Stasis_dermatitis
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