Differential diagnosis
The following annular skin conditions should be considered in the differential diagnosis:
- tinea corporis
- pityriasis rosea
- nummular eczema
- psoriasis
Note: Lack of any vesicles, scales or pustules help in differentiating granuloma annulare from the above named conditions. Less common conditions that need to be ruled out include:
- erythema migrans of Lyme disease
- subacute cutaneous lupus erythematosus
- erythema annulare centrifugum
Note: the latter two conditions have associated scaling. Other rare conditions that are in the differential of granuloma annulare include:
- sarcoidosis, which may present with reddish-brown to purplish infiltrated papules and plaques that commonly are found on the face
- Hansen's disease (leprosy), which also has erythematous annular plaques with associated scaling, alopecia, and anesthesia (1)
Reference:
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