Differential Diagnosis for Left Indurated Area on Axillary Region
Single Most Likely Diagnosis
- Lipoma or Fatty Nodule: Given the description of an indurated area without signs of infection (streaking, warmth, or redness), a benign growth such as a lipoma is a plausible explanation. The pain on palpation could be due to the size or location of the lipoma causing pressure on surrounding tissues.
Other Likely Diagnoses
- Cyst or Abscess: Although the absence of warmth and redness makes an abscess less likely, it's still possible, especially if the infection is deep or partially treated. A cyst could also present as an indurated area and might be painful if it becomes inflamed or infected.
- Lymphadenopathy: Enlarged lymph nodes in the axillary region can present as indurated areas. The pain on palpation could be due to inflammation or infection of the lymph node. The cause could range from a benign reactive process to something more serious like lymphoma.
- Hidradenitis Suppurativa: This condition involves recurrent, painful abscesses and nodules in the apocrine-gland-bearing areas of the body, such as the axillae. Early stages might not show significant redness or warmth.
Do Not Miss Diagnoses
- Breast Cancer: Although less common, breast cancer can present as a painless lump, but in some cases, it might be painful, especially if it involves the skin or is located near nerve endings. The axillary region is a common site for metastasis, and any new, unexplained mass should prompt consideration of breast cancer, especially in high-risk individuals.
- Lymphoma: Similar to breast cancer, lymphoma can cause lymphadenopathy that might be painful. It's crucial to consider this diagnosis, especially if the lymphadenopathy is persistent or accompanied by systemic symptoms like weight loss or fever.
Rare Diagnoses
- Soft Tissue Sarcoma: These are rare tumors that arise from the soft tissues, which include muscles, tendons, fat, and blood vessels. They can present as a lump or mass and might be painful if they press on nerves or surrounding structures.
- Madura Foot or Mycetoma: Although more common in the foot, mycetoma can occur in other parts of the body, including the axillary region, especially in immunocompromised individuals. It's characterized by a localized, granulomatous infection that can cause an indurated mass.