How to get rid of an itching backside?

For about a month now i've had a slight redness around my and it itches now and then. It's not painful, just feels like ive sat on a stinging nettle at times! I'm not bleeding, nothing unusual in other ways, it's just a small rash kind of thing. I think it was caused by a reaction to an all over body spray i used which caused a stinging sensation when some ran down my back. It's quite an annoying problem but nothing terrible, any ideas how to cure it? I dont think it's piles or worms as it doesn't seem that bad, it's only when walking i feel it, sitting is fine.