Certification in Infection Prevention and Control (CIC) Practice Exam

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What characterizes a nodule in dermatology?

It is less than 0.5 cm
It is filled with pus
It is a solid lesion greater than 0.5 cm
It is flat and discolored

The correct answer is: It is a solid lesion greater than 0.5 cm

A nodule in dermatology is specifically characterized as a solid lesion that measures greater than 0.5 cm in diameter. Nodules can occur in various skin conditions and can be located in the dermis or subcutaneous tissue. Their larger size compared to other lesions like papules (which are smaller than 0.5 cm) allows for differentiating nodules from other forms of skin growths. This definition is essential for correctly identifying various skin lesions and their implications for diagnosis and treatment. For instance, despite some lesions being filled with pus, they typically describe other entities such as pustules, and flat, discolored lesions refer to macules or patches rather than nodules. Thus, understanding nodule characteristics helps in the accurate classification of skin conditions, leading to appropriate management strategies.