Help!

Ok I will admit this is the first real issue I have as with my vagina since I was a kid cause I use to get really bad infections or rash I guess is what it was all the skin around my vagina would be red and irritated and it burnt. I was given cream from my doctor and it helped a lot.

Anyway I noticed in the past couple of days may 2-3 days my vagina has been really itchy and a darker colour then normal and I just figured it was due to the lace on my underwear I had on for the first day, after I showered and changed to some soft cotton panties I was still pretty itchy.

I have also noticed I don’t have much discharge and for what I get it is my usual clear slippery like and has little to no smell to it.

It gradually got worse and today I was really itchy and made the mistake of scratching I believe I have split some skin and obviously now it burns 10x worse then what it did before.

I don’t think it could be an std or sti as I have not had any form of sex in two weeks and my partner has been tested before.

Does anyone know why it’s so itchy and stings so much?