Patch testing should be considered in chronic discoid eczema as contact allergy to metals, such as nickel and chromate, have been commonly reported. What is the differential diagnosis of discoid eczema? Discoid eczema may resemble other annular skin eruptions including tinea corporis, plaque psoriasis, and pityriasis rosea.

Nummular dermatitis (or eczema) is also known as discoid eczema (or dermatitis). It has two forms: Exudative (‘wet’) nummular dermatitis; Dry nummular dermatitis; Exudative nummular dermatitis The exudative variant starts acutely and may persist for weeks, months and rarely years. Although it may arise at any age, most subjects are over 50 ...

Annular scaly plaques in discoid eczema, chronic plaque psoriasis, seborrhoeic dermatitis, pityriasis rosea, discoid lupus, porokeratosis, and tinea (dermatophyte infection) Annular smooth, urticated lesions in urticaria, Sweet syndrome, polymorphous light eruption, subacute cutaneous lupus erythematosus and systemic lupus erythematosus.

Granuloma annulare is often initially misdiagnosed as tinea because of the annular appearance; the lack of surface scale should lead away from this and other scaly rashes such as discoid eczema or psoriasis. Actinic granuloma is considered by some to be a photo-aggravated variant of granuloma annulare, and by others to be a distinct entity.

Annular scaly plaques are also common in discoid eczema, chronic plaque psoriasis, seborrhoeic dermatitis, pityriasis rosea, porokeratosis, and sarcoidosis. What is the treatment for erythema annulare centrifugum?

View pictures of annular erythema in the gallery below. Annular erythema is a descriptive term that refers to a number of chronic annular and erythematous skin eruptions. It may occur at any time throughout life, from infancy to old age. The eruption usually begins as a small raised pink-red spot that slowly enlarges and forms a ring shape while the central area flattens and clears.

View pictures of granuloma annulare in the gallery below. Granuloma annulare (GA) is a common inflammatory skin condition typified clinically by annular, smooth, discoloured papules and plaques, and necrobiotic granulomas on histology. Granuloma annulare is more correctly known as necrobiotic papulosis.

Annular lichenoid dermatitis of youth slowly progresses, with no serious complications being reported to date. The duration of annular lichenoid dermatitis of youth varies. Out of 21 cases described from 2005 to 2013, most lesions were successfully treated with topical corticosteroids but these recurred once therapy was discontinued [2].

Venous eczema. Affects one ankle initially then may spread to other leg and can generalise (autoeczematisation) Signs of venous disease: hardened, narrowed ankle (lipodermatosclerosis), orange-brown discolouration (haemosiderin) +/- Varicose veins

It is also called annular erythema. Lesions may be classified into superficial or deep subtypes. Deep lesions are more elevated, with less scale and pruritus than superficial lesions. There are associations with various infectious agents, medications and autoimmune disease. However, the majority do not have an underlying disorder.