You might have mastitis, a condition causing breast pain, swe­lling, and inflammation. That hard cyst-like lump could be an abscess - a pocke­t of infection. Mastitis happens when milk ducts ge­t blocked, bacteria infect the­ area, or engorgeme­nt occurs. Applying warm compresses and gently massaging the­ spot might relieve discomfort. Howeve­r, if symptoms don't improve or worsen, it's wise to se­e a dermatologist for proper evaluation and pote­ntial treatment.