What is this and how should I treat it?

Looks like a tunga penetrans aka a chigoe flea, id see a doctor since they need to be surgicaly removed.

dont rip it but take a needle and poke it to drain the pus you want that outer layer of skin though, alcohol and youll be fine.

Unless he's living in central or south america, its definitely not that.

It's something called Erlend Bauermanns syndrome. Unless treated causes rapid neural degeneration. Starts out as pus filled infections. Be careful user.

You can always trust medical advice from Yea Forums

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