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Annular skin lesions

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* some typically non-scaling disorders may occur as less common variants with scale

** atopic dermatitis is common, but discoid or annular lesions are relatively uncommon

(1) Smith LC et al. A guide to annular eruptions. Dermatology in Practice (April 2008); 16(1).

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morphology		scale, hyperkeratosis or crust usually present	non-scaling*
Typically annular lesions	common/fairly common causes	ringworm (scaling particularly at margin) porkeratosis (keratotic border) pityriasis rosea - herald patch	granuloma annulare Jessner's lymphocytic infiltrate morphoea (not annular lesions but often has annular violaceous margin)
	less common causes	erythema annulare centrifugum subacute cutaneous lupus erythematosus pigmented purpuric dermatoses (fine scale only) linear IgA disease, chronic bullous dermatosis of childhood actinic granuloma eczema surround a naevus (Meyerson's naevus)	purpura annularis telangiectodes serum sickness and serum sickness-like drug eruption erythema (chronicum) migrans 'annular erythemas' with deeply situated infiltrate
Often includes some annular or incompletely annular (arciform) lesions	common/fairly common causes	psoriasis bullous pemphigoid seborrhoeic dermatitis of the trunk subacute cutaneous lupus erythematosus (papulosquamous/psoriasiform type) impetigo	urticaria erythema multiforme lichen planus (particularly male genital) *
	less common causes	mycosis fungoides atopic dermatitis **	cutaneous sarcoidosis* B-cell lymphoma of skin

Annular skin lesions

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