I think this is directly related to the cannula. When you put one in it obviously puts a hole into a blood vessel. Therefore when one is removed a little hole is still present where blood can leak out of which is why you're supposed to put pressure on the area for some time after; to close the hole over so it can clot. Sometimes you can put pressure on it but you can still get some leakage to a greater or lesser extent and as it's under the skin it may be in a slightly different place to where the hole is on the skin as the blood vessel could'v moved a bit or the bleeding could've found a pocket in the skin where it collected/ similar. This is perfectely normal and often if they're only little like this one seems it's not painful at all (big ones can be as it can cause swelling around and/or the clotted blood creaes pressure on the surrounding tissue) and as it is blood under the skin (a haematoma) then yes, it's totally normal to first start off purple. It will then start to go a darker colour before going a browny colour and then yellowing up.
It's nothing to worry about at all.
The only thing is if it starts getting bigger in size/ the surrounding area becoming reddened/ it getting hot/ swollen/ painful/ red lines are coming off this up your arm then go and get it checked out as there is always a small chance of getting infection there which can be really dangerous but no more so with this than with any other cannula.
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