Erysipelas: Causes, Symptoms and Treatment
Erysipelas is a bacterial skin infection causing sharply defined redness, swelling, and warmth. It requires prompt medical treatment with antibiotics.
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Erysipelas is a bacterial skin infection causing sharply defined redness, swelling, and warmth. It requires prompt medical treatment with antibiotics.
What is Erysipelas?
Erysipelas (also known as St. Anthony's Fire in historical contexts) is an acute bacterial infection of the skin and superficial lymphatic vessels. It most commonly affects the lower legs and face, although any area of the body can be involved. Erysipelas is a serious condition that can lead to severe complications if not treated promptly.
Causes
Erysipelas is most commonly caused by Group A Streptococci (Streptococcus pyogenes), and less frequently by other streptococcal species or staphylococci. The bacteria enter the skin through small breaks or lesions. Common entry points include:
- Minor wounds, abrasions, or cracks in the skin
- Fungal infections of the foot (tinea pedis, or athlete's foot)
- Ingrown toenails or insect bites
- Chronic skin conditions such as eczema or psoriasis
- Lymphedema or chronic venous insufficiency
Risk factors include a weakened immune system, diabetes mellitus, obesity, and pre-existing impairment of lymphatic drainage.
Symptoms
Erysipelas typically begins with general systemic symptoms, followed rapidly by characteristic skin changes:
- Systemic symptoms: Sudden high fever (often above 39 degrees Celsius), chills, fatigue, and headache
- Local symptoms: A sharply demarcated, flame-shaped area of redness that spreads quickly
- Significant swelling, warmth, and tenderness in the affected area
- Tense, shiny skin surface
- Occasionally, blistering or small skin hemorrhages (hemorrhagic erysipelas)
- Painful swelling of nearby lymph nodes
Diagnosis
Erysipelas is primarily diagnosed clinically, based on its characteristic appearance and associated symptoms. Additional investigations may include:
- Blood tests: Elevated inflammatory markers (CRP, white blood cell count) confirm active infection
- Wound swabs or cultures to identify the causative organism
- Ultrasound imaging to distinguish erysipelas from deeper infections such as cellulitis or necrotizing fasciitis
It is important to differentiate erysipelas from other conditions such as deep vein thrombosis, contact dermatitis, or necrotizing fasciitis, as these require different management approaches.
Treatment
Erysipelas is treated with antibiotics, targeting the bacterial cause. Treatment may be administered on an outpatient or inpatient basis depending on severity:
Outpatient Treatment
- Oral antibiotics, typically Penicillin V or Amoxicillin, for 7 to 14 days
- For patients with penicillin allergy: alternatives such as Erythromycin or Clindamycin
- Elevation of the affected limb to reduce swelling
- Cool, moist compresses to relieve local discomfort
Inpatient Treatment
- Intravenous antibiotic therapy for severe cases, high fever, or immunocompromised patients
- Close monitoring of inflammatory markers
- Treatment of the site of bacterial entry, such as a fungal foot infection
Without treatment, erysipelas can spread to deeper tissues (cellulitis), enter the bloodstream (sepsis), or progress to the life-threatening condition known as necrotizing fasciitis. For recurrent erysipelas, long-term low-dose antibiotic prophylaxis may be recommended.
Prevention
The following measures can help prevent erysipelas:
- Careful wound care, even for minor injuries
- Consistent treatment of fungal skin infections
- Good skin hygiene and moisturizing, especially for dry or cracked skin
- Compression therapy for lymphedema or chronic venous insufficiency
- Optimal management of underlying conditions such as diabetes mellitus
References
- Deutsche Dermatologische Gesellschaft (DDG): Guideline on Erysipelas and Cellulitis. AWMF Registration No. 013-006 (2021).
- Sunderkotter C. et al. - S2k Guideline on Skin and Soft Tissue Infections. Journal der Deutschen Dermatologischen Gesellschaft (JDDG), 2019.
- Stevens D.L. et al. - Practice Guidelines for the Diagnosis and Management of Skin and Soft Tissue Infections. Clinical Infectious Diseases, Oxford University Press, 2014.
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Related search terms: Erysipelas + Erysipela + St. Anthony's Fire + Rotlauf