Pox Pustules on Elementals?

[Millefune]

Need help on a ruling, please?

Another player cast Pox Pustules on an Air Elemental. The DM said it doesn't go off at all, because the Elemental doesn't have any skin. We couldn't find anything in the rules that said that the spell wouldn't work on the elemental. Is there something we're missing?

Given that air elementals don't have skin really, so it wouldn't make real world sense, but neither does magic. Anyway, should the spell have been able to affect the elemental?

[VRMH]

RAW: Yes, it should have worked. An Elemental is not immune to [disease] effects.

RAI: we can never be certain, but I say it should work. "You inflict a painful, itching rash on the target creature". Note there is no requirement of having a skin. And Air Elementals can be hit, so they have a tangible body and can therefore get a rash.

[Millefune]

Thanks, I figured as much. I just needed confirmation that I wasn't missing anything.