Skin reactions can be alarming, especially when they appear suddenly. Many people struggle to tell the difference between hives and a rash, but knowing the cause is the first step toward relief.

Dermatographism is a form of pressure urticaria in which hives will form along the lines of trauma wherever the skin is scratched, rubbed, or roughly stroked. The term "dermatographism" literally ...

It’s more than fair to wonder what’s happening if you suddenly develop a skin rash, especially if they’re not a regular thing for you. But rashes happen for a range of reasons, from products ...

Aquagenic urticaria is a rare condition where people have an allergic skin reaction to water. The reaction typically involves hives and bumps and can occur as often as several times a day.