pruri-, prur-, prurit- +

(Latin: itch, itching; be wanton, be eager for)

antipruritic
1. Relieving or preventing itching.
2. An agent that relieves or prevents itching.

Despite about a century of research, no single effective antipruritic treatment exists

Several topical and orally administered agents can help suppress itching. These include lotions and creams; such as calamine and hydrocortisone, antihistamines, opioid antagonists, aspirin, and ultraviolet light therapy.

—Excerpts from
"How do itches come about, and why does it feel good to scratch them?"
answered by Mark A.W. Andrews, associate professor of physiology
at the Lake Erie College of Osteopathic Medicine;
Scientific American, June, 2007; page 80.
aquagenic pruritus (s) (noun)
1. A skin disease characterized by the development of severe, prickling-like epidermal discomfort which is without observable skin lesions and that is evoked by contact with water at any temperature.
2. An intense itching that is the result of brief contact with water of any temperature, but which does not produce any visible changes in the skin.
autotoxic pruritus
Pruritus attributed to endogenous toxins, as in jaundice, uremia, etc.
bath pruritus, bath itch
Itching produced by inadequate rinsing off of soap or by over drying of the skin from excessive bathing.
ocular pruritus
A subjectively perceived problem of or a complaint of itching around the eyes.
pruigo
1. A chronic inflammatory skin disease causing small itchy swellings.
2. A chronic skin disease having various causes, marked by the eruption of pale, dome-shaped papules that itch severely.
3. Any of various itchy skin eruptions of unknown cause, in which the characteristic lesion (prurigo papule) is dome-shaped with a small transient vesicle on top.
pruriceptors
Itch-sensing nerve endings caused by certain mediators; such as, stimulating agents including chemicals for immune response (such as, histamines) and pain relief (such as, opiods).

Scratching and rubbing interfere with the sensations arising from pruriceptors by stimulating various pain and touch receptors in the same areas.

Like many sensory systems in the body, activation of one signal, in this case that of the pain and touch receptors, causes "surround inhibition" of another signal, that coming from the pruriceptor.

The lack of pruriceptor firing "turns off" the itch sensation for a short period. Although it is helpful in relieving an itch, scratching offers only temporary relief and may cause the skin to become further irritated and possibly even to tear it, causing bleeding.

—Excerpts from
"How do itches come about, and why does it feel good to scratch them?"
answered by Mark A.W. Andrews, associate professor of physiology
at the Lake Erie College of Osteopathic Medicine;
Scientific American, June, 2007; page 80.
prurience
1. Having, inclined to have, or characterized by lascivious or lustful thoughts, desires, etc.
2. Causing lasciviousness or lust.
3. Having a restless desire or longing.
4. Etymology: from 1630–40; Latin prurient-; from Latin prurire, "to itch."
pruriency
Feeling morbid sexual desire.
prurient
1. Having or intended to arouse an unwholesome interest in sexual matters.
2. Characterized by an inordinate interest in sex: "She had prurient thoughts."
3. Arousing or appealing to an inordinate interest in sex: "Many people are interested in prurient literature."
pruriently
In a prurient manner.
pruriginous
1. Tending to, or caused by, prurigo.
2. Affected by, or of the nature of, prurigo.
prurigo
A chronic disease of the skin marked by a persistent eruption of papules that itch intensely.
prurigo aestivalis, actinic prurigo, summer prurigo
An itching which returns each summer, becoming very severe as long as the hot weather continues.
prurigo mitis
A mild form of a chronic dermatitis characterized by recurring, intensely itching papules and nodules.