What kind of seasonal allergy could cause a skin rash?

See Below: Seasonal allergies do not usually directly cause skin rashes. However, people with seasonal allergies are more likely to suffer from asthma an eczema due to an overall increased sensitivity to allergens.

Pollen or molds: Any seasonal allergy can cause or aggravate eczema including trees, grass, weeds and even outdoor mold spores. Keeping windows closed during the specific season is useful in decreasing exposure to the outdoor or seasonal allergens.