Final answer:
The client is most likely describing fibroadenomas, which are noncancerous breast tumors characterized by soft and movable masses that can become enlarged during menstruation.
Step-by-step explanation:
The client is most likely describing fibroadenomas. Fibroadenomas are noncancerous breast tumors characterized by soft and movable masses in the breasts.
These masses can become enlarged during menstruation due to hormonal fluctuations in the menstrual cycle. Fibroadenomas are common in young women and do not usually pose a significant health risk.
To confirm the diagnosis, the client should consult a healthcare professional for further evaluation and possibly a breast biopsy.