- Abscess
A skin abscess, or boil, is a swollen, painful, red and warm lump of skin that may rupture and drain pus.
- Nipple stimulation
Nipple stimulation can cause red, irritated, hard or erect, and sensitive nipples, and even discharge.
- Muscle strain
Muscle strain occurs when muscles are stressed, overworked, or injured due to physical activity or labor.
- Hematoma
A hematoma is a collection of blood in the tissue outside of a damaged blood vessel, usually after an injury.
- Nipple irritation
Nipple irritation may cause nipple pain, redness, skin dryness and cracking, and bleeding around the nipple.
- Mastitis (infectious)
Mastitis, an infection of the breast, causes pain or swelling of the breast, fever, and flu-like symptoms.
- Puberty
Puberty is the time when a young person becomes sexually mature.
- Cellulitis
Cellulitis, a bacterial infection of the skin, causes red, tender skin that is usually swollen and warm.
- Bruise or contusion
Bruises, or contusions, cause skin discoloration, swelling and tenderness.
- Trauma or injury
Trauma most often refers to serious bodily injury or wounds symptoms range depending on the injury.
- Benign lipoma
Lipomas are a harmless collection of fatty cells that form a round or oval, rubbery lump under the skin.
- Epidermal (sebaceous) cyst
Epidermal (sebaceous) cysts are painless, moveable lumps that form beneath the skin's surface.