How long does severe discolouration last after a skin graft?

I had a skin graft a couple of months ago to treat a full thickness burn. I've had a skin graft before and it stayed red for a while but this one is full on purple. Will it stay this colour? I've not been massaging it every day as the physios told me to do (I know, stupid) but I thought that was all about flattening it as much as possible.

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