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Anyone know which family this should be placed in?
And...whether the red stuff is fungal?

23.06.24 - wetland near Lima, Peru

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The red stuff are indeed fungi, apparently Stigmatomyces. As concerns the fly, missing of orbitals leads me to Leucopis, but I am not sure if the arista is bare or not. Anyway I do not know South American fauna of acalyptrates. Btw, years ago I found a Leucopis with such fungi on Canary Islands. The fungi seem to be undescribed. If you keep the creature from the picture, please let me know.

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Many thanks Jan!
I wondered about Chamaemyiidae but was unable to find images of anything quite like it.
Great to know the fungi too.
I am afraid I did not catch this one.
I will try to catch if I see another with similar infection.

Here is a better shot of the aristae fwiw :

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Hmm

Another dipterist who specialises in Lauxanioidea said the following on iNaturalist :
"Definitely not a chamaemyiid - maybe Ephydridae?"

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The bristling of the head is typical of Ephydroidea and not of Lauxanoidea.

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On iNaturalist Niels-Jan Dek thought Ephydridae most likely :
"It looks superficially like Nostima or Philygria and also has a pectinate arista, but these genera have (pre)sutural dorsocentrals and this fly hasn't"