article_snippet.sent: Swellings known as weals appear between 15 minutes and two hours after exposure to water .
article_snippet.sent: These swellings (weals) may be pale, pink, or red, of different sizes and shape and itchy.
article_snippet.sent: As the raised weals flatten, they leave red marks that disappear usually in a day.
article_snippet.sent: New weals appear between 15 minutes and two hours after exposure to water.
article_snippet.sent: It is a red raised itchy rash and is very common, affecting one person in five at some point in their life. '