Triamcinolone is used to treat a number of different medical conditions, such as eczema , Lichen sclerosus , psoriasis , arthritis , allergies , ulcerative colitis , lupus , sympathetic ophthalmia , temporal arteritis , uveitis , ocular inflammation , Urushiol-induced contact dermatitis , aphthous ulcers (usually as triamcinolone acetonide ), visualization during vitrectomy and the prevention of asthma attacks. It will not treat an asthma attack once it has already begun.    It has also been used off-label for macular degeneration . 
How often cortisone injections are given varies based on the reason for the injection. This is determined on a case-by-case basis by the health care practitioner. If a single cortisone injection is curative, then further injections are unnecessary. Sometimes, a series of injections might be necessary; for example, cortisone injections for a trigger finger may be given every three weeks, to a maximum of three times in one affected finger. In other instances, such as knee osteoarthritis, a second cortisone injection may be given approximately three months after the first injection, but the injections are not generally continued on a regular basis.
The most common side effect of topical corticosteroid use is skin atrophy. All topical steroids can induce atrophy, but higher potency steroids, occlusion, thinner skin, and older patient age increase the risk. The face, the backs of the hands, and intertriginous areas are particularly susceptible. Resolution often occurs after discontinuing use of these agents, but it may take months. Concurrent use of topical tretinoin (Retin-A) % may reduce the incidence of atrophy from chronic steroid applications. 30 Other side effects from topical steroids include permanent dermal atrophy, telangiectasia, and striae.