Differential Diagnosis for Soft Protusions on the Side of the Heel
- Single Most Likely Diagnosis
- Haglund's deformity (pump bump): This condition is characterized by a bony enlargement on the back of the heel that can cause soft tissue inflammation and lead to the formation of a soft protusion. It's common in individuals who wear tight or ill-fitting shoes.
- Other Likely Diagnoses
- Bursitis: Inflammation of the bursae (fluid-filled sacs) near the heel can cause soft protusions. This is often due to repetitive friction or pressure on the area.
- Heel spur: Although a heel spur itself is a bony growth, the associated inflammation can lead to soft tissue swelling, which might be perceived as a soft protusion.
- Plantar fasciitis: While primarily causing pain and inflammation on the bottom of the heel, severe cases can lead to swelling on the sides of the heel.
- Do Not Miss Diagnoses
- Soft tissue sarcoma: Although rare, any unexplained soft tissue mass should prompt consideration of a sarcoma, as these can be deadly if not diagnosed and treated early.
- Infection (e.g., abscess or cellulitis): Infections in the foot can quickly become serious, especially in diabetic or immunocompromised patients, and require prompt treatment.
- Rare Diagnoses
- Ganglion cyst: A benign lump that can occur on the foot, including near the heel, due to a herniation of a joint or tendon sheath.
- Lipoma: A benign tumor composed of fat tissue, which can occur almost anywhere on the body, including the heel area.
- Rheumatoid nodule: In patients with rheumatoid arthritis, these nodules can form over bony prominences, including the heel, due to chronic inflammation.