Almsot any lump in the breast can be a breast cancer, although, fortunately, breast cancer is quite uncommon in women your age, and most breast lumps in women who are in their 20s turn out to be benign.
Unfortunately, one cannot accurately tell if small lumps in the breast are cancerous (or not) simply by looking at them or feeling them. So, a mammogram and ultrasound are appropriate diagnostic studies in your case.
As you are concerned about the possibility of cancer, I cannot help but to note that you are a smoker. Smoking is the #1 cause of preventable cases of cancer in the world. Secondly, your use of tanning salons will also put you at increased risk of developing skin cancer, including melanoma (which is a potentially deadly form of skin cancer).
Sincerely/ Robert A. Wascher, MD, FACS
http://doctorwascher.com
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