Blood blister/Purpura on face - treatment?

So there was this red spot on my left cheek that wouldn't go away for months.  Just now it was bothering me so I poked it with a needle.  The amount of blood that came out of this little shallow hole was incredible.  It ran down my face and dripped for a few minutes and then simply stopped and the red spot disappeared. 

Will this spot return?/Is there any way to prevent it returning?  Thanks

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