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Erythema Nodosum - Coggle Diagram
Erythema Nodosum
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Aetiology
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Precipitating factors
Infection
Bacterial: Streptococcus, TB, Yersinia, Rickettsia, Chlamydia, Leprosy
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Fungal: Histoplasmosis, Blastomycosis, Coccidiodomycosis
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Systemic disease: Sarcoidosis, IBD, Behcet's disease
Malignancy: Leukaemia, Hodgkin's disease
Drugs: Sulphonamides, Penicillin, OCP
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Symptoms
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Systemic symptoms: fatigue, fever, weight loss, arthralgia
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Examination
Crops of red or violet dome-shaped nodules on both shins, tender on palpation
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Investigations
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CXR for signs of sarcoidosis, TB and fungal infections
References: Rapid Medicine (2010), Amir H. Sam
What it looks like: 