Crab louse

Crab lice, also called pubic lice, (singular, louse) commonly called "crabs" due to their resemblance to a crab, are one of three kinds of human lice in the large group of lice families, the others being head lice and body lice, which live in clothing. Its scientific name is Phthirus or Phthirius pubis, literally 'pubic louse' (from Greek φθειρ : louse).

They are wingless, about 1 to 3 mm long. They attach themselves to hair strands, and hatch out of lidded pods called "nits". Ones that are too tightly attached to be brushed off must be removed by pulling with the nails or a fine-tooth comb.