Differential Diagnosis > Morphology > Color > Red

Red

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aka "erythema"

 

not a useful group (unless broken down into smaller ddx's) because almost everything is red in dermatology

 

smaller ddx's:

hmtoggle_plus1acral erythema

acral erythema of chemotherapy

neutrophilic eccrine hidradenitis

GVHD

erythromelalgia

perniosis

toxin-mediated erythema

 

 

vs. "palmar erythema I have never found this to be a useful finding nor differential diagnosis"

collagen vascular disease
cirrhosis
pregnancy

reticulate erythema

hmtoggle_plus1generalized erythema

must decide which ddx to apply:

toxin-mediate erythema
always consider drug

flushing

annular erythema

localized erythema