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It’s where the folds are sitting. You should go get it swabbed to make sure no fungal / infections etc but otherwise make sure you’re showering (twice a day tbh) and making sure you keep it really dry. Seen people saying talc but personally wouldn’t use talc as it’s known to be not great for you. I find a wipe with a baby water wipe (the branded water wipes) helps loads if I notice it getting red or skin touching etc it usually clears it up quite quickly.
I got something like this at the beginning of my recovery and it was a sweat rash due to moisture trapped from my apron belly. Clean the area and try putting a pad in the fold to keep the area dry but still taking breaks to air the area out and it should heal Ina few days. If it doesn’t clear I’d phone your gp to check for a fungal infection x
I had this and it was infection. Not sure if it’s the skin around or the actual incision but it’s totally gone now after antibiotics and cleaning the area with Dermol (prescribed by Dr but can be bought OTC). Also. Make sure the area is totally dry. My pharmacist recommended a microfibre towel, used only for your scar and it’s been a million times better than a normal towel x
You should contact your doctor.