Is this a sign of infection after nose graft? (Photos)

Hi there, i had a revision rhino a couple of months ago (end of january). A graft of ear cartilage was placed at the bridge. Since a couple of days i have a purple spot on the nose tip. I'm wondering if this is malicious and if this is a sign of infection. Nothing was done on the nose tip, only (mainly) upper bridge. I don't feel particularly sick, there is no pus and it's not painfull. Should i worry about it or is this just a normal pimple? Thanks in advance

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