Hives are a skin condition where small bumps appear on the skin. Similar to rashes, hives can appear red and are often itchy and uncomfortable. Hives have many potential causes, but one very common cause of hives is an allergic reaction. If you are allergic to seasonal allergens like pollen or ragweed, you might experience hives when these allergens come in contact with your skin. In this article, we will cover how hives are caused ...