Since how long is the lump? Is it painful and / or tender? Is it mobile all around? Is the skin adherent (stuck) or free from the lump?
Hello Andrea Lewallen,
The modern medicine sometimes gives lot of weight and is too much dependent on investigations. Ultrasonography, mammography, and even MRI of the breast may not be able to discern the difference or diagnose the breast lumps, but old medical teachings are always reliable. The history of trauma is important here and finding of observed swelling after the injury is very important feature in the history and diagnosis. I would keep it traumatic fat necrosis, as the first possibility . The trauma causes fat necrosis, or breakdown of the adipose tissue. The second possibility would be lipid cysts. Mammary duct ectasia would be third consideration which can occur in prepubertal boys and girls.
All of them are benign but biopsy is usually essential to relieve the anxiety.
Please feel free for your follow up questions.
Oh yes, it should be seen by a specialist, a pediatric surgeon or a general surgeon. Any mass will change the nipple color because of the pressure and affecting the blood supply. Ultrasound are usually very good modality to tell the difference between a fluid or cystic swelling and a solid swelling. Since it pointed out for cyst, a low grade abscess may also be in the consideration (abscess usually are tender and painful).
It is pleasure assisting you.
You are welcome.
I would like to mention one thing. Usually websites and books will mention only the classical features of the diseases. So people may be many times misguided reading them or don't get the correct perspective. Diseases very uncommonly come in copy book styles.
Hope this helps.
You are always welcome.
I wish a very fast recovery for your daughter.
Let me know the follow up, if possible.