Dear myauntiem: It is most common to have mastistis (breast infection) while lactating. However, infection can also occur, though uncommonly, in women who are not lactating. These may present as abscesses, which can be drained. As uncommon as breast infections are in young women, inflammatory breast cancer is also very uncommon in this age group. If the mass and redness persists, it is reasonable to have it re-evaluated, preferrably a breast specialist.
Thank you so much for taking the time to answer my question. I found your answer very helpful.
infections occur most commonly in nursing women, but they can occur in anyone. Also, not every infection -- especially one at the surface -- is actually a "breast" infection: skin glands can cause infection anywhere. IBC would be extremely rare at that age, nor does it usually present as a very localized lump with redness over it. It needs to be followed to a clear conclusion; and might need minor surgical attention if it's not clearing up quickly (meaning drainage or an abcess or removal of a skin cyst.) Seeing a surgeon if it doesn't fully respond soon might be necessary.