I have never heard of it, and I'm pretty sure none of my friends has either. This might be one of the words that are still used only by elders and villagers/small-townsmen.

I'm not sure, but this is what I found on the internet: ARGOSHË m. vet. Puçrra të vogla që i dalin njeriut në trup nga vapa ose nga ndonjë sëmundje. So I think it's a kind of an acne or just pimples.