Hi Dew,
Whenever I am in the sun (which isn't often here in the UK lol), I seem to go bright red even if I wear a high protection sun tan.
I never used to go red before I got RSD, I would just tan and go a nice browny colour.
The redness that I have doesn't feel like a sun tan. It burns a lot but it doesn't feel like the ones that you get with sun tans.
I hope that it isn't an RSD rash for you and that it will go away soon!

Sorry I cant help you any more!!