It's highly uncommon for a 15-year-old to develop breast cancer, but any unusual changes, including lumps, should be taken seriously. It's crucial to consult with a healthcare professional for a proper examination and diagnosis.

There are various reasons for lumps in the breast, and they can be related to hormonal changes, cysts, or other non-cancerous conditions. A healthcare provider will typically conduct a thorough examination, possibly including imaging tests like an ultrasound or mammogram, to understand the nature of the lump.

If you're concerned about your daughter's situation, it's essential to reach out to a healthcare professional promptly. They can provide accurate information based on her specific health history and symptoms. Additionally, consider using a cancer navigation platform, which can offer support in managing the process of diagnosis and treatment. Always prioritize seeking professional medical advice for personalized and accurate information.