Allergic sensitivity to a topical corticosteroid is usually only picked up when an eczematous dermatitis being treated by a topical corticosteroid fails to respond to treatment or worsens. In cases of persistent or exacerbating dermatitis treated with corticosteroid preparations, corticosteroid sensitivity should be considered. However, it may also be due to irritation from or allergy to other components of the preparation such as preservatives . Lanolin , ethylenediamine , quaternium-15 and the antibacterial agent neomycin , are all known to be potent sensitisers.
Even though topical corticosteroids such as creams or ointments are applied to the surface of the skin, they can still cause side effects . Long-term use or excessive use can lead to thinning of the skin, irritation, dryness, or changes in skin color. If your doctor recommends that you occlude your psoriasis areas -- wrapping them in plastic after applying a topical corticosteroid to boost the effect -- side effects may be more common. More serious side effects may occur with topical corticosteroids if used in high doses for prolonged periods. You may become resistant to the helpful effects of topical corticosteroids over time, too.