Overview. Sand flea bites look like small red raised bumps. Sometimes they appear in clusters.
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Sand flea bites. Sometimes, not always, the female sand flea lays her eggs underneath the skin; the large welts will have a black dot in the center. If that happens, you should seek medical attention because the black dot indicates eggs have been laid.
Can fleas live in your bedding? Fleas can live in beds for about one to two weeks, and they like to burrow under sheets. Fleas need blood to survive, though, so they won't stay in one place for too long if there is no food source.
Sand fleas are parasitic crustaceans that vary in size. They can be small like a dot of ground pepper or grow to about the size of a rice grain, to something bigger, visible to the naked eye.