Hi. That small tender lump may just be an inflamed lymph node signifying an infection around your breast area (mastitis). It could also be one of the non-cancerous breast masses such as fibroadenoma, which could also appear as a painful lump. You're doing the right thing in having it checked by the doctor immediately. I hope everything turns out fine.
Hi.
There are many causes of breast lumps, and your description of this lump accompanied by pain may be a classic manfiestation of fibrocystic breast disease or fibroadenoma. These represent an unusual reaction of the breast tissues in response to hormonal changes, and may wax and wane throughout the menstrual cycle.
However, since this is the first time you had this, it is best that you have this examined formally by your doctor. From the physical characteristics of the lesion alone, he may be able to tell if this is more likely benign or would need further testing.
I agree with the consult you are planning, and I wish you all the best.
Regards.