Favus, from the Latin for honeycomb, is a chronic fungal disease of the scalp, resulting in encrustations and hair loss. It is caused by the fungus Trichophyton schoenleinii . Once widespread, it is now easily curable and has been eliminated from most parts of the world.
Scabies is caused by a mite ( Sarcoptes scabiei ), and is characterised by superficial burrows and intense itching (scabere means "to scratch" in Latin). Crab lice and fleas are parasitic insects that feed on blood. Crab lice are typically found around the genitals.
Pityriasis is the flaking of skin.
Eczema is the inflammation of the epidermis, leading to rashes, swelling and blistering.