This could be candida
From what you discribed , any change in ph of the vagina can cause over growth of candida which will lead to itching ,redness,and burning sensation . You may also have cheesy white discharge . Don't worry it's very common to have it and it is very easy to treat . But its always better to check with your doctor asap
You may have a yeast infection. I had one and your vagina itches inside and out. Smells Kinda bad and a thick white discharge comes out. Also Kįndå burns when you you touch it at all.