Which of the following is a common symptom of a fibroadenoma?

A fibroadenoma is a benign tumor commonly found in the breast tissue, primarily in younger women. The typical presentation of a fibroadenoma is a firm, movable lump that can be easily distinguished upon physical examination. These lumps are not usually painful, and their mobility is a key characteristic that helps in differentiating them from other types of breast masses.

These growths are generally smooth and well-defined, making them easily palpable. Their benign nature is part of why they are so commonly encountered in clinical practice. The ability to move the lump under the skin is important for diagnosis, as many other breast conditions may not present this same feature.

In contrast, the other symptoms associated with breast conditions mentioned in the options do not align with the characteristics of fibroadenomas. Fluid discharge is often associated with infections or other abnormalities, skin discoloration may indicate more serious conditions, and breast asymmetry could arise from various factors unrelated specifically to fibroadenomas. Thus, the palpable, movable firm lump is the defining symptom of a fibroadenoma.