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Tinea pellionella
You can find them in every home in the south of México really small about 1 cm whit all the case, carry it´s home whit him, small worm inside a case moving on the wall and ceilings usually a big population we have to clean the ceilings very often. Photo take outside the house moving on a wall.The adults of this small moth have a wingspan of 9–16 mm. Their forewings are grizzled brown with one large and a few smaller indistinct black spots. The hindwings are plain pale brown-grey. The forewings, but especially the hindwings are surrounded by a hairy fringe. Wikipedia.
It is widespread essentially all over Europe, but also occurs (as an introduced species) in such places as North America and México. Wikipedia.
Someone from the San Diego Natural History Museum told me they are the nymph (or something like that) of a moth that eats clothing. We have these here in San Diego, too.