Differential Diagnosis for Multiple Cysts Under the Armpit
Single Most Likely Diagnosis
- Axillary Hidradenitis: This condition is characterized by recurring, painful abscesses or cysts in the armpits due to blocked apocrine sweat glands. It's a common condition that matches the description of multiple cysts under the armpit.
Other Likely Diagnoses
- Epidermoid Cysts: These are benign cysts that can occur anywhere on the skin, including the armpits, and are filled with a cheesy material. They can become inflamed and infected, presenting as multiple cysts.
- Folliculitis: An inflammation of the hair follicles, which can lead to the formation of cyst-like structures, especially in areas prone to friction and sweat, such as the armpits.
- Sebaceous Cysts: Similar to epidermoid cysts but are filled with a thick, cheesy material and can occur in the armpits, though they are less common here than on the face or neck.
Do Not Miss Diagnoses
- Lymphoma: Although rare, lymphoma can present with lymphadenopathy (enlarged lymph nodes) in the armpits, which might be mistaken for cysts. It's crucial to differentiate between benign cysts and potentially malignant lymph node enlargement.
- Tuberculosis: In rare cases, tuberculosis can manifest as axillary lymphadenitis, which might be confused with cysts. Given the potential severity of TB, it's essential to consider it in the differential diagnosis, especially in endemic areas or in individuals with risk factors.
Rare Diagnoses
- Steatocystoma Multiplex: A rare genetic disorder characterized by the development of multiple sebaceous cysts, which can occur in the armpits among other areas of the body.
- Axillary Breast Tissue Cysts: In some individuals, especially women, accessory breast tissue can be present in the armpits. Cysts can form in this tissue, presenting as axillary masses or cysts.