The first and most obvious one is if you notice small white bugs in your home. They will usually stay in dark areas near a source of moisture such as a sink, toilet or bathtub. If you suddenly turn on the lights they will freeze for a moment, and then make a run for it to a hidden place. They can crawl even in the tiniest cracks and crevices, so it’s important to cover them if you have any.
Since they are so slim, they can also slide under various objects that appear to be in direct contact to the floor. The next sign of Silverfish is finding damaged books or paper products. They will usually have a large hole, surrounded by other smaller ones. These insects can be very annoying for those who are collecting paper products such as old newspapers, documents, comic books, stamps and so on. Silverfish actually love the stamps because of their combination of paper and glue.
And least but not last, yellow stains and black specks can also be signs of Silverfish. These are the bug’s excrements. So if you ever notice one or more of the signs above, it’s time to call a specialist.