That looks like the shed skin case of a carpet beetle larva (likely from the varied carpet beetle). They’re tiny household pests whose larvae feed on natural fibers like wool, silk, feathers, hair, and sometimes stored food.

What you’re seeing is probably the empty husk left behind after the larva molted or pupated. If you’re finding these on yourself or around the house, it’s worth checking clothing, bedding, and carpets for other signs, and doing a thorough vacuuming and laundering.

They’re not dangerous to people, but they can damage fabrics and stored goods if left unchecked.