Opening in scar

Has anyone else had this problem - Last Friday I noticed and felt a pink part of my vertical hysterectomy scar.  It’s now Monday and I’m off tomorrow to see my doctor, as it’s got worse and is very sore.  I have my final chemo session this week, and I’m worried it will be put back.  I don’t have a temperature.  I had my hysterectomy on 29th May.