Not all sand fleas will bite and feed on humans, but those that do can cause painful, itchy bites. They hop through the sand much like the common flea, eventually landing on human skin and inflicting an uncomfortable bite.
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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.