Hello thank you for trusting HCM Dear are you male or female??in male in puberty due hormonal changes cause subareolar mass in puberty. thus is not a cancerous condition it will doesnt cause any problem may subside with age. in female it may be fibroadenoma or fibroadenosis. check pain change with cycle or not.how consistency and any associated lymphnode enlargement may be checked. fibroadenoma incidence peaking at 20-24 years of age. They are the most common type of breast lesion. Fibroadenomas arise in breast lobules and are composed of fibrous and epithelial tissue. They present as firm, non-tender, highly mobile palpable lumps. Hormones seem to be involved in aetiology, and hormone replacement therapy (HRT) increases the incidence. As with all unexplained lumps, referral should be made to a specialist breast clinic. Women are assessed by the triple assessment of examination, imaging (first-line choice is ultrasound before age 40, mammogram after) and needle biopsy (not necessarily required under the age of 25. please consult your surgeon he will examine and treat you accordingly. take care