What is a common characteristic of dermatitis?

Dermatitis is characterized by inflammation of the skin, often resulting in various symptoms that can include redness, swelling, and notably, itching. Itchy skin, or pruritus, is a common and prominent symptom of dermatitis, which can be caused by various factors such as allergies, irritants, or underlying health conditions. The sensation of itchiness can lead to further discomfort, and it often encourages individuals to scratch the affected area, which can exacerbate the condition.

In contrast, the other options refer to different medical conditions. Pressure ulcers involve localized damage to the skin and underlying tissue, typically caused by prolonged pressure. Senile purpura is related to the skin's fragility with aging, presenting as easy bruising. Dental caries are tooth decay caused by bacterial infection. Each of these conditions is distinct from dermatitis and does not share the common item of itchy skin as a characteristic symptom.