I walk/stand 8h shifts, have developed shin and ankle petechia that tingles at rest, later the spots turn brown.

Venous insufficiency: The symtoms are typical of venous insufficiency. Wearing compression hose, soft comfortable shoes, and elevating your feet periodically can help. A vein speciallist can do specicific tests to determine the extent of the problem. It is important to obtain an evaluation because this problem can lead to deep venous blood clots in the legs.