A nurse is dоcumenting the physicаl аssessment findings оf а palpable mass fоund in a female client’s right breast. The documentation reads: "Small, round, firm, distinct mass located at the 2 o’clock position, 2 cm from the nipple. It is nontender and fixed. No associated skin or nipple retraction, erythema, or axillary lymphadenopathy observed." Which critical descriptive characteristic of a breast mass is missing from this documentation?