Differential Diagnosis > Morphology > Color > Red
Red
not a useful group (unless broken down into smaller ddx's) because almost everything is red in dermatology
smaller ddx's:
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"
reticulate erythema
must decide which ddx to apply:
flushing
annular erythema
localized erythema