It is available by prescription only and comes in various strengths (0.025%, 0.1% and 0.5%) and forms (lotions, creams and ointments). Kenalog, the brand name version of triamcinolone, is also available in a topical aerosol spray. Triamcinolone is generally a very inexpensive topical steroid, and therefore is commonly prescribed by physicians for allergic skin rashes.
Triamcinlone is generally applied to the affected skin areas two to three times a day for up to two weeks at a time. Using triamcinolone for longer periods, especially with the higher strength forms or with the ointment versions, may cause irreversible side effects. Triamcinolone is too potent of a topical steroid to use on the face or on other areas of the body with thin skin, such as the genital region. If triamcinolone is used on children, only the lowest potency forms should be applied.
Learn more about the treatment of itchy skin.
Source:
Boguniewicz M, Leung DYM. Atopic Dermatitis. J Allergy Clin Immunol. 2006; 117(2):S475-80.
DISCLAIMER: The information contained in this site is for educational purposes only, and should not be used as a substitute for personal care by a licensed physician. Please see your physician for diagnosis and treatment of any concerning symptoms or medical condition.

