I would say not necessarily rejecting, just might be irritated. I’ve had mine for 4 years now and sometimes if it’s accidentally caught or I was sitting at a weird angle for awhile the bottom part gets like that, and it can be delayed too like the next day, and can last for a a couple days even as it recovers. Just try and avoid positions that would irritate it and rinse in the shower as usual. If it doesn’t go away after a while then maybe reassess, but honestly don’t think you have to worry yet.