Other Eczematous Eruptions

Published on 05/03/2015 by admin

Filed under Dermatology

Last modified 22/04/2025

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11

Other Eczematous Eruptions

The major forms of dermatitis include atopic (see Chapter 10), contact (see Chapter 12), seborrheic, asteatotic (xerotic), stasis, and nummular. Dermatitis of special sites – i.e. hands, feet, lips, diaper area, and major body folds – is reviewed in Chapter 13, and pityriasis alba is reviewed in Chapters 10 and 54.

Seborrheic Dermatitis

Common disorder with both an infantile and an adult form (Figs. 11.1 and 11.2); unusual in children.

Possibly related to components of sebum and Malassezia spp.

Severe or recalcitrant seborrheic dermatitis can be a sign of underlying HIV infection or neurologic disorder.

In adults, tends to be a chronic relapsing disorder; stress or tapering of systemic CS can lead to a flare.

Symmetric distribution pattern that includes sites of greater sebum production – scalp, ears (external canal, retroauricular fold), medial eyebrows, upper eyelids, nasolabial folds, central chest – and major body folds.

Lesions are pink-yellow to red-brown in color, depending on the underlying skin phototype, and they often have greasy scale, especially in the head and neck region; occasionally annular in configuration.

On the scalp, involvement tends to be more diffuse, with well-circumscribed plaques with thicker silvery scale more characteristic of psoriasis.

In some patients, the lesions of the scalp, ears, and major body folds have features of both seborrheic dermatitis and psoriasis, leading to the term ‘sebopsoriasis’.

DDx: psoriasis, contact dermatitis, other causes of diaper dermatitis (see Fig. 13.4), intertrigo (see Fig. 13.2) or blepharitis, tinea versicolor (presternal), tinea capitis (especially in children), atopic dermatitis, pityriasis amiantacea and dermatomyositis (scalp); may coexist with rosacea.

Rx: topical anti-fungal creams and daily shampooing (e.g. ketoconazole, ciclopirox, selenium sulfide or zinc-containing shampoo alternating with a gentle shampoo), mild topical CS on the face and in body folds and moderate-strength topical CS for the scalp and ears; topical calcineurin inhibitors (e.g. tacrolimus ointment).

Stasis Dermatitis

Pruritic dermatitis with scale-crust and sometimes oozing that favors the shins and calves; historically often begins near the medial malleolus.

Patients often have a history of chronic lower extremity edema and may have a history of deep vein thromboses and/or recurrent cellulitis.

Often accompanied by other signs of chronic venous hypertension (Table 11.1).

One of the more common causes of autosensitization (Fig. 11.4).

DDx: allergic contact dermatitis, irritant contact dermatitis, asteatotic eczema, nummular dermatitis; may accompany other causes of the red leg, especially cellulitis and acute or chronic lipodermatosclerosis (Fig. 11.5), but the latter lack the clinical and histologic findings of dermatitis.

Rx: exclude superimposed allergic contact dermatitis (e.g. neomycin, preservatives in topical creams) or component of infectious eczematous dermatitis if draining ulcer; open wet dressings for a few days, mild topical CS ointments, leg elevation, pressure stockings (after excluding arterial insufficiency via ankle–brachial index), endovascular ablation of large varicosities, water-in-oil emollients for maintenance therapy.