Itching & rash go away & come back!

I ran into some coral while diving. I had a rash for a couple of days and it went away. Almost a week later the rash came back. What do I do now?
We frequently receive calls from individuals who experienced itching, burning and redness of the skin after a marine encounter of unknown origin. Usually the symptoms disappear after one to two days, but sometimes they abruptly return. This can occur anytime from two to five days after the initial encounter, and the recurring symptoms may be worse than they were initially.

According to DAN consultant Dr. Bruce Miller, a board-certified dermatologist, dive medicine physician and diver, this is a ‘delayed hypersensitivity reaction’, or reaction to a toxin. Unlike a systemic (whole body) allergic reaction, which may affect larger skin areas or other organs, the delayed reaction tends to remain confined to the injury site.

“Once this delayed reaction occurs,” Miller says, “topical hydrocortisone cream (which is often part of the usual initial treatment) may have little or no benefit. The recommendation is to be evaluated by a physician, because oral steroids may be required to treat the reaction.”

Think of this delayed reaction as being similar to a very bad case of poison oak, says Miller. “Without proper treatment, the symptoms can persist for weeks or longer. It’s important to seek evaluation by a physician to ensure no secondary infection exists from the skin breaks that can occur when the skin is scratched too vigorously.”
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