two points to make:
| • | annular and reticulate and gyrate overlap (or exist on a spectrum): a single lesion of a reticulate or gyrate rash will be annular (examples of this are neonatal lupus and erythema marginatum; both can be classified as either annular or reticulate) – TJM |
| • | figurate erythema is the broad category and includes: gyrate, annular, circinate, arcuate, serpiginous, polycyclic, reticulate |
Annular ddx:
| • | annular erythema ddx: EAC, erythema chronicum migrans, erythema marginatum, erythema gyratum repens, gyrate erythema NOS, urticaria |
| • | dermal annular ddx (= granulomatous plus dermal EM): leprosy, actinic granuloma, granuloma annulare, sarcoid |
| • | papulosquamous annular ddx: SCLE, DLE, annular LP, porokeratisis, tinea, seborrheic dermatitis, "EAC automatic ddx" |
| • | "EAC automatic ddx": PR, secondary syphilis, parapsoriasis, MF |
| • | other annular - purpura annulares telangiectoides, bullous disease of childhood, neonatal LE |
This group of disease should be thought of together automatically (if you think of one, then all of them should at least cross your mind. The diseases are all annular (in at least one of their forms) and scaly.
The list: EAC, PR, secondary syphilis, parapsoriasis, MF, extended list: erythema gyratum repens
Mnemonic:
|
Annular by Distribution:
|
|
Distribution: |
Disease: |
soles, palms |
EM, secondary syphilis |
face |
seborrheic dermatitis, actinic granuloma, sarcoid, the 5 L's (especially Jessner's), annular syphilid |
lower extremities |
purpura annulare telangiectoides vs. angioma serpiginosum, +/- NLD |
extremity |
erythema migrans |
penis |
annular LP |
extensor surface |
Granuloma Annulare |