5 most common kid skin rashes and sensitivities (and how to soothe them)

A hallmark of hives is that they come and go, sometimes within minutes or hours, but definitely within a day or two. If the spot has been there for more than two days, it’s not a hive. In some cases, the cause might be easy to trace—your kid eats a strawberry and a splotch appears on his upper lip.

But sometimes it’s not as easy to figure it out: Hives can appear up to three weeks after a virus has passed. One or two spots don’t necessarily warrant a doctor’s visit, but if you’re unsure, have it checked out.