Differential Diagnosis for Skin Lesion on Left Shoulder
- Single most likely diagnosis
- Lipoma: A small, benign tumor made of fat tissue, which can cause a bump under the skin and is often found on the shoulders, neck, and back. The slight redness could be due to minor inflammation or irritation.
- Other Likely diagnoses
- Cyst: A closed capsule or sac-like structure that can contain fluid, semi-solid, or gaseous material, which may cause a bump and slight redness if infected or inflamed.
- Abscess: A collection of pus that has built up within the tissue of the body, indicating a local infection, which could cause redness, swelling, and a bump.
- Dermatofibroma: A small, hard bump that typically develops following a minor injury, most often on the legs but can appear elsewhere, including the shoulders.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Skin Cancer (e.g., Melanoma): Although less likely, any new or changing skin lesion should be evaluated for the possibility of skin cancer, as early detection is crucial for treatment and survival.
- Infected Sebaceous Cyst: If the bump is an infected sebaceous cyst, it could lead to more serious infections like cellulitis or abscesses that require prompt medical attention.
- Rare diagnoses
- Dermatological manifestations of systemic diseases (e.g., Rheumatoid Nodules in Rheumatoid Arthritis): While rare, some systemic diseases can cause skin lesions that might resemble a bump with slight redness.
- Xanthoma: A rare condition characterized by the accumulation of excess lipids in cells, which can lead to the formation of small bumps under the skin, often associated with lipid disorders.