The case of the brown dots

[rbakker]

Thanks for the ideas!

hotinhawaii - they are larger than typed periods, not raised
leilaniguy - I have plenty of geckos inside the house and have never seen this there. Also plenty on the lanai, maybe gecko blood?
oink - I think it's too big to be fly poo, sorry I didn't describe the size, they're mostly round, like drops of water
birdmove - could be fungus, but nothing like I've ever seen and in strange locations