Lice and scabies are parasites living and feeding off human skin and blood.
Lice
Lice live on the scalp, as everyone knows, and likes playing hide and seek between the hair roots. Luckily (and unluckily) the give themselves away by biting and drinking blood, making the scalp itch, giving us the opportunity to declare lice war and get rid of them chop-chop with your friendly neighbourhood helper, Paranix. You don’t have to resort to pesticides.
Scabies
Scabies, on the other hand, are microscopic little mites, which lives on the skin of the body. In most cases, scabies develops only after close and prolonged contact with an infected person, but it can also be transmitted by sharing clothing (they hide in the seams), towels and bedding. Scabies can live in bedding for 24 hours or even more! Severe itching is the primary symptom. This is caused by the female mite, which burrows into the skin, lays her egges and produces toxins that cause allergic reactions, which causes this maddening itch. Small red bumps can then form on the skin.
References:
http://www.webmd.com/skin-problems-and-treatments/guide/skin-conditions-lice-scabies?page=2
