Lumps are usually caused by a hormone excess imbalance, usually either one of prolactin, estrogen or progesterone.
I'm not 100% sure, but it could be too much prolactin during menstruation. You said the discomfort only happens around that time, which is when prolactin is usually the dominant hormone, and you massage them which further increases prolactin. At least stop massaging during and near menstruation. If you are going to massage, do it at another time of your cycle.
Plant fiber and green tea should reduce cysts and reduce chances of cancer growing or spreading. Ginger root fights cancer too, but it acts as either prolactin or progesterone, so take whole ginger at a time when you're not menstruating, and with a higher proportion of green tea. Cysts are not always cancerous, but they can easily turn into it. The concerning thing is the discomfort you mentioned.
See if the problem goes down if you take green tea and stop massaging during menstruation.
You may need to see a doctor, especially if it worsens.
I'm not 100% sure, but it could be too much prolactin during menstruation. You said the discomfort only happens around that time, which is when prolactin is usually the dominant hormone, and you massage them which further increases prolactin. At least stop massaging during and near menstruation. If you are going to massage, do it at another time of your cycle.
Plant fiber and green tea should reduce cysts and reduce chances of cancer growing or spreading. Ginger root fights cancer too, but it acts as either prolactin or progesterone, so take whole ginger at a time when you're not menstruating, and with a higher proportion of green tea. Cysts are not always cancerous, but they can easily turn into it. The concerning thing is the discomfort you mentioned.
See if the problem goes down if you take green tea and stop massaging during menstruation.
You may need to see a doctor, especially if it worsens.