I thought the patches could only be used after 6-8 weeks and it's fully healed
I have this one from Amazon and have been using it since my scar healed fully (around 8 weeks pp). I’m now 7 months pp and my scar is so light in colour and the texture is a lot better! I was a category 1 emergency csec and my scar was really textured and wonky, but wearing the tape 24/7 has definitely, definitely helped! X https://amzn.eu/d/3xKeNoR
I have been using them since like 3 months postpartum? .. I’m nearly 7 months post now. They do keep my scar moisturized and help with clothes rubbing on it but in terms of them changing the colour of it, no. I would recommend starting to use them asap and I’d bet you would see good results, I think I waited too long. If your doctor is recommending them go for it!
Following this as I'm in exactly the same boat!