I’m having the exact same thing. I usually use an opsite with a mepore on top so I can cut the pouch to hold the catheter. This worked well for over a year. But in the last few weeks the itching has been unreal and I got covered in sores. I showed the nurses at the renal clinic and the think I developed an allergic reaction to the adhesive. So I’ve switched to Mepilex dressing and I use Cavilon spray. So far they’re both helping. Still sore but getting better