Substance growing on grout?

I found this today after the shower hadn’t been used for about 12+ hours. I noticed there was grout crumbling right below this area a few days ago. Is it some form of mold or mildew? Should I re grout and reseal this area? Thanks I’m advance!

Hopefully the link works, first time using (and first time tiling so ignore the crooked tiles lol)

submitted by /u/ajduryea95

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