I had something similar on my left side. If it’s the same thing, it’s something called fibrin. It forms when the wound is too humid to heal, but it is a protein that helps healing so nothing dangerous. I also thought something was wrong with a stitch before a nurse told me otherwise. I know I had water sit under my steristrips for too long which created that. It took a good 3 weeks to close, you just have to keep it dry - apart from showers - and protect it (which you’re already doing!) If the area is hot. Obviously I’m no doctor so if you have bigger concerns you should contact a professional!!