Tooth or Epstein pearl?

Hi my 4 month old who is normally very happy has become very grumpy over last 3 days screaming most of the day and Night and a temperature. I have noticed this white hard lump where my thumb is in her mouth. I thought it was a tooth but heard its uncommon to start with teeth there. Any ideas whether it's a tooth or Epstein pearl I have read it could be. Thanks in advance
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