Differential Diagnosis for Skin Infection
- Single Most Likely Diagnosis
- Cellulitis: This is a common skin infection caused by bacteria, typically Streptococcus or Staphylococcus, characterized by redness, swelling, warmth, and pain in the affected area.
- Other Likely Diagnoses
- Impetigo: A highly contagious skin infection often seen in children, caused by Staphylococcus aureus or Streptococcus pyogenes, presenting with honey-colored crusts on the skin.
- Folliculitis: An infection of the hair follicles, usually caused by Staphylococcus aureus, which can appear as small, pus-filled bumps on the skin.
- Abscess: A localized collection of pus in the skin, often caused by Staphylococcus aureus, which can be painful and may require drainage.
- Do Not Miss Diagnoses
- Necrotizing Fasciitis: A severe and potentially life-threatening infection that destroys tissue under the skin, requiring immediate medical attention.
- Erysipelas: A type of skin infection that involves the upper dermis, typically caused by Streptococcus, and can be associated with systemic symptoms like fever.
- Gas Gangrene: A rare but deadly infection caused by Clostridium perfringens, characterized by gas production in the tissues, which can lead to rapid progression and high mortality if not promptly treated.
- Rare Diagnoses
- Leprosy (Hansen's Disease): A chronic bacterial infection caused by Mycobacterium leprae, affecting the skin, nerves, and mucous membranes, more common in tropical and subtropical regions.
- Cutaneous Anthrax: A rare but potentially deadly infection caused by Bacillus anthracis, which can enter the body through cuts or scratches in the skin, and requires prompt treatment.
- Sporotrichosis: A fungal infection caused by Sporothrix schenckii, typically acquired through skin contact with contaminated soil or plants, presenting with lesions or ulcers on the skin.