I saw this on my belly today. I had petechiae on my belly and a UTI. Took an antibiotic. A week later my belly sparkles in the sun. I also have subacute chronic disseminated histoplasmosis. I suspect it's something being excreted from skin, like oxalates or salt or something similar. I also have hemorrhage on the white of one eye, which happens occasionally since I had the histoplasmosis. I think it might be due to high blood pressure.