CAUSES :
A. LOCALIZED ERYTHEMA
1. INTERNAL
- BOIL
- HERPES SIMPLEX
- HERPES ZOSTER
- IMPETIGO
- ERYSIPELAS
- GOUT
- THROMBOPHLEBITIS
- LYMPHANGITIS
2. EXTERNAL
- IRRITANT - THERMAL , CAUSTIC , TRAUMATIC
- ALLERGIC
- FIXED DRUG ERRUPTIONS
B. LOCALISED PATTERNS OF ERYTHEMA
- ROSACEA
- PALMER ERYTHEMA
- ERYTHEMA AB IGNE
- LIVEDO RETICULARIS
- ERYTHEMA ANNULARE CENTRIFUGUM ( LYME DISEASE )
- ERYTHEMA INDURATUM ( BAZIN DISEASE )
C. GENERALIZED ERYTHEMA
- TOXIC ERYTHEMA
- EXANTHEMAS ( MEASELS , RUBELLA , SCARLET FEVER , ERYTHEMA INFECTIOSUM , HIV INFECTION )
- ERYTHEMA MULTIFORME
- ERYTHEMA NODOSUM
- LUPUS ERYTHEMATOSUS
- DERMATOMYOSITIS
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