i had a similar problem, mine had actually opened a little bit towards the end of the scar on about day 10 and it only now well about a couple of weeks that it started to heal properly had to keep going back to mya every 3 days for them to check and change my dressing! was so annoying and really annoyed me as it delayed everything, sometimes certain people just take longer to heal, i didnt do anything straining to make that happen it just happened, but i wouldnt worry, it will heal itself naturally just have to be patient! i will be 8 weeks post op this thurs and my scar is still not 100% as its been delayed healing and i still worry about it so much now! x