Nits hatch into young lice called nymphs, which take seven to 10 days to mature into adults roughly the size of sesame seeds. Adult lice feed on their host’s blood several times a day and live ...

Related: Causes and Treatments for Itchy Skin (Pruritus) Body lice are the size of sesame seeds and are oblong. Bites are ...

First thing's first. Sea lice aren't lice at all. They're tiny baby jellyfish, so small you can't even see them -- about the size of a grain of pepper. And just like their grownup counterparts ...

But viewing the combs at 10 times normal size revealed their true purpose: Many still bore traces of the lice and nits they had extracted from someone’s tresses. In pre-Columbian times ...