Identify a potential side effect of prolonged use of topical steroids.

Prolonged use of topical steroids can lead to thinning of the skin, also known as atrophy. This side effect occurs due to the steroid's effects on the dermal and epidermal layers of the skin, where it can inhibit collagen synthesis and lead to a decrease in the structural integrity of the skin over time. As the skin becomes thinner, it becomes more susceptible to damage and may appear more fragile, which is a significant concern for patients using these medications for extended periods.

While allergic reactions can happen with any topical medication, they're not a typical side effect of long-term steroid use. Increased hair growth is generally associated with other mechanisms, such as hormonal changes. Fungal infections are more likely to occur due to the immunosuppressive effects of steroids, though they are not direct symptoms of the skin atrophy that comes with continued steroid application. Understanding the specific effects of topical steroid use is crucial for proper management and patient education to avoid long-term skin complications.