What characterizes a nodule?

A nodule is characterized as a solid round bump that measures larger than 1 cm in diameter. This definition helps distinguish nodules from other types of skin lesions, such as papules, which are smaller elevations, and cysts or blisters that may contain fluid. Nodules can arise from various conditions, such as infections, inflammatory processes, or growths like tumors, and their solid nature is part of what defines them. Understanding the specific criteria for nodules is crucial for accurate diagnosis and effective treatment in nail and skin care practices.