Urgh, we read this article recently and it highlighted some awful things that can breed in your damp towels if you leave them long enough! We were very surprised (and disgusted) about what can appear in your towels if they are left on the floor and not washed!
Silverfish, booklice, springtail, centipede and woodlice find damp places ideal breeding grounds and can really thrive, so pick up that towel off the floor and hang it on you heated towel rails or towel radiators!