Small Lump Found-Concern Necessary?

Yes, yes and yes, please make an appointment to see your doctor. All lumps in the breast need to be examined and tested accordingly. What you are describing sounds like either a blocked duct, infection of a duct, a cyst or a benign tumor called a fibroadenoma, which can form in and around the breast. The treatment depends on what it is, cysts will usually be aspirated with a fine needle, with you being asked to return for a checkup in a few months, or some are left alone, infections may require draining and antiboitics will be needed, and a fibroadenoma can be removed surgically with minimal scarring.

Breast cancer in a woman your age is very rare, less than 1% of women your age will develop it, but all lumps in the breast require assessment by a doctor, and usually a referal for an ultrasound. I doubt you will be given a mammogram as the breast tissue in younger women is too dense, ultrasound is better, radiation free and painless.