help asap duck weird growth

  1. Googoogaagaa

    Weird growth near butt

    Since yesterday, there is a brownish-black tumour like growth (the size of a blueberry) hanging out from my duck's butt (male) . At first, thinking it was poop, i tried to wash it off with water but realised that it's hard as stone and it won't come off. Is this harmful? Should I do something...
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