Differential Diagnosis for a Firm Lump on the Plantar Surface of the Foot
- Single Most Likely Diagnosis
- Plantar wart: This is the most common cause of a firm lump on the plantar surface of the foot. It is caused by the human papillomavirus (HPV) and can be painful, especially when pressure is applied.
- Other Likely Diagnoses
- Plantar callus: A thickened area of skin that can develop due to repeated pressure or friction on the plantar surface of the foot.
- Plantar fibroma: A benign growth of fibrous tissue that can occur on the plantar surface of the foot, often causing pain and discomfort.
- Morton's neuroma: A condition where the tissue around a nerve in the foot becomes thickened, causing pain and a lump-like sensation.
- Do Not Miss Diagnoses
- Plantar melanoma: A type of skin cancer that can present as a firm lump on the plantar surface of the foot. It is essential to consider this diagnosis to ensure early detection and treatment.
- Deep tissue infection (e.g., abscess or cellulitis): Infections can cause firm lumps on the plantar surface of the foot and require prompt medical attention to prevent serious complications.
- Rare Diagnoses
- Plantar ganglion cyst: A rare, benign cyst that can develop on the plantar surface of the foot, often causing pain and discomfort.
- Lipoma: A rare, benign tumor composed of fat tissue that can occur on the plantar surface of the foot.
- Plantar schwannoma: A rare, benign tumor of the nerve tissue that can occur on the plantar surface of the foot, often causing pain and discomfort.