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Around my house I've been spotting these very small brown/tan spotted bugs:
It moves quite slow, and doesn't seem to fly, only crawl (though it does look like it has wings). It's very small, not much bigger than a sugar ant for comparison.
What is this bug? This is in the Philadelphia region of Pennsylvania.
This is almost certainly one of the Dermestidae, known as skin bugs or carpet beetles. I think this is probably a varied carpet beetle (Anthrenus verbasci) They are a common world-wide pest and the larvae are known to eat a range of mostly animal-derived materials containing keratin or chitins, including things like wool, silk, leather, bone, horn and feathers.
The larvae look a lot like a very small hairy caterpillar (photo by André Karwath aka Aka, CC BY-SA 2.5 https://creativecommons.org/licenses/by-sa/2.5, via Wikimedia Commons):
and the adults (photo by Donald Hobern from Copenhagen, Denmark, CC BY 2.0 https://creativecommons.org/licenses/by/2.0, via Wikimedia Commons:
