Strange Issue after Exporting

I recently finished designing a weird mushroom/overgrown skull idea I had and exported it to an STL after I had finished in order to send it to a printer. Upon opening the file however these weird protursiouns appeared from the model that I can't see when it is in Tinkercad. Any assistance is welcome.

The model within Tinkercad (above) and the model in Ultimaker Cura (below)


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