Genital itching, often called jock itch, is most often caused by a fungal infection anywhere on the genitals. It may start as just a small patch of red but advance to serious inflammation . Other intense itching can be caused by scabies or pubic lice . In women genital itching, called pruritis vulvae, can be the first sign of a yeast infection. In both sexes, intense genital itching and pain can be the beginning of herpes simplex type 2.
Liver disorders produce itching combined with jaundice .
Nerve irritation, known as neuropathy or neuritis , often causes pain along with severe itching. Pink eye is the common name for a contagious infection that causes red eyes with a yellowish, crusty discharge, itching, and burning. Poison ivy, oak and sumac are plants to which most people are allergic, so exposure to them causes a severe skin rash that itches intensely. Shingles , also known as herpes zoster , is a viral nerve disease produced by the same virus that causes chicken pox. It almost always results in a rash along a long, thin area of the body, following a nerve, and burning or stabbing pain along with itching.