Differential diagnosis of annular rash are:
-psoriasis
-tinea corporis / body ringworm
-erythema multiforme
-erythema nodosum
-granuloma annulare
-erythema migrans
-Lyme disease
-discoid lupus eryrthematosus
-nummular ( discoid) eczema
-pityriasis rosea
-secondary syphilis
-psoriasis
-tinea corporis / body ringworm
-erythema multiforme
-erythema nodosum
-granuloma annulare
-erythema migrans
-Lyme disease
-discoid lupus eryrthematosus
-nummular ( discoid) eczema
-pityriasis rosea
-secondary syphilis