Differential Diagnosis for Tender Erythematous Toe
- Single Most Likely Diagnosis
- Paronychia: This is an infection of the skin around the nail, which is a common cause of a tender, erythematous toe. It often results from bacterial infection, usually Staphylococcus aureus, and can be caused by trauma, nail biting, or picking at the nail.
- Other Likely Diagnoses
- Ingrown Toenail: This condition occurs when the nail grows into the surrounding skin, causing pain, redness, and swelling. It's a common issue, especially in the big toe, and can be exacerbated by poor foot hygiene, tight footwear, or improper nail trimming.
- Cellulitis: A bacterial skin infection that can cause redness, swelling, and tenderness, often affecting the lower legs and feet. It can be caused by Streptococcus or Staphylococcus bacteria and may follow a break in the skin.
- Gout: A form of arthritis characterized by sudden, severe attacks of pain, swelling, redness, and tenderness, often in the big toe. It's caused by elevated levels of uric acid in the blood.
- Do Not Miss Diagnoses
- Osteomyelitis: A bone infection that can cause pain, redness, and swelling in the affected area. It's a serious condition that requires prompt treatment to prevent long-term damage.
- Septic Arthritis: A joint infection that can cause severe pain, redness, and swelling. It's a medical emergency that requires immediate attention to prevent joint destruction.
- Deep Vein Thrombosis (DVT): A blood clot in a deep vein, which can cause pain, swelling, and redness in the leg. It's a potentially life-threatening condition if the clot breaks loose and travels to the lungs.
- Rare Diagnoses
- Erythromelalgia: A rare disorder characterized by burning pain, heat, and redness in the hands and feet. It can be primary (inherited) or secondary (associated with other conditions).
- Complex Regional Pain Syndrome (CRPS): A chronic pain condition that can cause burning pain, swelling, and changes in skin temperature and color, often in the arms or legs. It's a rare condition with unclear causes.