Onion finger - Altmeyers Encyclopedia - Department Allergology

Definition
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Dry, hyperkeratotic eczema (see below eczema, contact eczema) after contact with tulip, hyacinth or kitchen onions (see kitchen onion) The contact allergen is allicin, a sulphur-containing compound naturally found in garlic and the kitchen onion.

Therapy
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S.a. Eczema, contact dermatitis, allergic.

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General therapy
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Allergen-free.

External therapy
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Antiecematous local therapy with glucocorticoid-containing external preparations, e.g. 0.25% prednicarbate (e.g. Dermatop ointment or fatty ointment) or 0.1% methylprednisolone (e.g. Advantan) or in combination with urea (e.g. Hydrodexan).
Later on bland care e.g. with urea-containing topical creams (e.g. Nubral 4 cream, Basodexan cream, Linola Urea cream).

Internal therapy
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For itching use of an oral antihistamine: levocetirizine (e.g. Xusal) 1 tbl/day or desloratadine (e.g. Aerius) 1 tbl/day, cetirizine (e.g. Zyrtec) 1 tbl/day.