Rash sometimes experienced, swelling I haven't seen but then I dont spend a lot of time in front of the mirror after surfing. My advice is to experiment with various clothing until you find something that works for you.. I think I have had some 5 or 6 rash guard t-shirts and most of those are ok, but one of them gave me a bad rash, and I let a friend have it - who also ended up with the same problem. The shirt was passed to another friend with same negative result and is now rotting in a closet somewhere never to be found again.
On the other hand I think that as well as bad products there is a person factor in here, as someone says in this thread that the wetsuit causes problems with rash - to me that is exactly the best solution. However, with summer rolling over to autumn here it is still to hot most days to wear it, so I go on living with the odd rash day now and then. mer rolling over to autumn here it is still to hot most days to wear it.r
PS> if someone said central america was the solution I can at least provide witness that in South America we get rash too.