Can eczema be caused by food allergies?

Yes: Food allergy is a classic contributing factor that leads to exacerbation's in atopic dermatitis.

Not uncommon: Eczema, asthma other manifestations of food allergies are common.

Yes: Perhaps 1/3 of childhood eczema is due to one or more food allergies. An equal number have positive blood or skin tests but avoiding food has no effect. If skin does not improve dramatically in 2-3 weeks after beginning an elimination diet then food is not the cause. House dust mite allergy is more important than food allergy in eczema.

Eczema and allergy: Yes, especially in children. Consider evaluation by board certified allergist.

Food Triggers: Evidence to suggest that moderate/severe eczema in early childhood could be worsened by certain foods (usually highly allergenic foods like peanut, tree nuts, milk, eggs, etc.). Food triggers are not usually an issue with adult eczema. If you notice a consistent pattern of worsening eczema with a particular food then by all means avoid it. Skin prick testing better that patch. See Allergist.