105 results
Erythema Nodosum: In this case, E. Nodosum has occured secondary to 
Streptococcal infection.
Photo credit, Josh Fierer,
Erythema Nodosum ... : In this case, ... Goldberg, M.D. - UCSD ... #Dermatology #SkinRash ... #Photo #UCSDH
Pyoderma Gangrenosum: Autoimmune disorder resulting in a vasculitis which causes slowly progressive 
ulceration of the skin.
resulting in a vasculitis ... which causes slowly ... Goldberg, M.D. - UCSD ... #Dermatology #SkinRash ... #Gangrenosum #UCSDH
Causes of Erythema Nodosum - Mnemonic

NO cause found in 60% of cases
Drugs (antibiotics e.g., sulfonamides, amoxicillin)
Oral
Causes of Erythema ... Mnemonic NO cause ... Giardiasis #Erythema ... #Differential #Diagnosis ... #Dermatology #SkinRash
Benign Familial Pemphigus (Hailey-Hailey Disease): Idiopathic recurrent erruptions, in this
case affecting this axilla.

Charlie Goldberg, M.D. -
(Hailey-Hailey Disease ... erruptions, in this case ... Goldberg, M.D. - UCSD ... #Dermatology #SkinRash ... Axillae #Photo #UCSDH
Hand, Foot, and Mouth Disease: A febrile illness (caused by Coxsackie Virus) associated vesicle formation on
Foot, and Mouth Disease ... febrile illness (caused ... Goldberg, M.D. - UCSD ... Dermatology #Pediatrics #SkinRash ... Coxsackie #Vesicle #UCSDH
Erythema Annulare Centrifugum (EAC),
This is erythema annulare centrifugum (EAC), one of the “figurate erythemas.” These lesions
Erythema Annulare ... EAC), This is erythema ... Most cases are idiopathic ... drugs, systemic disease ... #dermatology #skinrash
Erythemas Summarized
Erythema ab igne
 • A dermatosis that results from repeated exposure to heat (fires, heating
early localized disease ... of necrotizing vasculitis ... called "Bazin's disease ... so-called fifth disease ... #differential #diagnosis
Erythema Nodosum - Causes and Differential Diagnosis 
Appearance:  erythematous painful lumps usually 1-6 cm in
Erythema Nodosum ... - Causes and Differential ... Diagnosis Appearance ... #Nodosum #Causes ... #Dermatology #SkinRash
Reactive Skin Rash - Differential Diagnosis Algorithm
Reactive erythematous with various morphology
 • Urticaria - Firm /
- Differential Diagnosis ... lasts <24hrs • Erythema ... #Reactive #SkinRash ... #Differential #Diagnosis ... #Algorithm #causes
Reversible Neurocognitive Disorders (Reversible Causes of "Dementia")
 • Structural/Mass: Subdural Hematoma, NPH, Intracranial tumor
 • Infection:
Disorders (Reversible Causes ... , Sleep apnea, Vasculitis ... , Nutritional UCSD ... #differential #diagnosis ... #causes #neurology