I have RV.
Forearms get hot and muscles become hard. Then flushing starts from elbows to hands. This lasts from about half hour to one hour. The feeling then subsides but I am left with red subcutaneous spots which disappear after a few days. Occasionally I am left with a haematoma which I suspect is a burst blood vessel and on one occasion my arm bled for no apparent reason except for as stated above.
Just curious but will raise issue with consultant when I next see them.