Does a physical barrier help? Have you tried a Lycra skin suit under the
offending wetsuit? If you're clear of the allergy under your swimming cossy
then a one-piece Lycra might help.

Keith L

  We saw a great deal of divers diving with drysuits in the Red Sea,
Sharm.  I don't see why it should be a problem.  During summer, there
might be some issues when you come out of the water, but summer is
hardly the time to go there anyway.

  /Marcin

Depends on the time of year.

I Did my OW in Sharm the beginning of June this year and wore a shorty,
after 50 minutes under I was cold.

On another boat with another school we saw an instructor with a dry suit and
hood teaching students with shorties.

"Thiourea compounds are used as accelerators in the rubber industry and are
known to cause ACD and photocontact dermatitis"

Interesting stuff with cross-references to other research at,

http://bjsm.bmjjournals.com/cgi/content/full/35/2/100

If you get bored, scroll down to "discussion"

Yes you can, depending on time of year.

I go to sharm regularly on land based, day boat holidays. I'm not sure if
this scenario is as accurate if on shore diving or a liveaboard when I
assume you have much more freedom as to when you kit up, jump, return etc.

From October/November to April/May I always take my membrane dry suit (with
lycra undersuit). The story always goes like this. First day I am the joke -
wimpy diver etc. however by the end of the 2nd day the divemasters/others in
our group who also have dry suits are having the last laugh as we are warm
at the end of a 60 min dive and the others are racing to get out of their
cold wet suits in the wind. Also of course (and best) I step comfortably
back into my dry suit for the second/third dive whilst the others are trying
to put on cold & wet wet suits. By the end of the week most will admit they
wish they had a dry suit too if only in private :-)

In summer (July/August) however I do take a wet suit as a wet suit will
mostly dry between dives and I expect a dry suit may be a bit sweaty and
uncomfortable whilst on the back of the boat waiting to jump.

i may have a solution for you i had the same problem you do and considered
a dry suit as a last resort.i did a lot of research and finaly got hold of
a sample of neoprene with a titanium coating wich gives a sufficen barrier
between the neoprene and your skin. i tried a lycra suit and the rash was
the same the nice thing about the titanium suit is that now instead of a
5mm wetsuit i only need a 3mm for the same warmth i suggest you try it.