temp/ water temp
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Traditionally, it occurs between April to June around the Florida, Mexico and the Caribbean islands. Most people don't even feel the stings in the water and it may be a day or two before the rash/itch starts. Some people are also more susceptible than others.
Precautions that locals take are covering the entire body with sunblock/sun tan lotion but I think there are special jelly fish sunblock available. The rash will appear on the area most covered with clothes so women should consider two-piece instead of one-piece bathing suits and t-shirts should be avoided for same reason. Also pin up long hair so they don't sting on back/neck where hair hangs down.
After bathing you should change out of bathing suits as soon as possible and if possible shower (do not shower with bathing suit you had on in sea). Bathing suits should be thoroughly washed with detergent and heat dried before using again.
Treatment for persons affected are usually OTC hydrocortisone cream and antihistamine.
As I said before for what ever reason some people aren't affected at all while others are so take the necessary precautions and enjoy.
So keeping our fingers crossed. Sea itch stays away....
btw...about how long does the itch last?
Personally, I won't bother with.
There was a thread on some of this in the Jamaica forum: