Main causes for redness:
Yeast infections(this usually affects the vulva, though, not the urethral opening): While symptoms vary, it is usually characterized by thick, cottage cheese like discharge. However, I've had yeast infections without the discharge, and just had a red and sore vulva.It is often itchy.
Irritation: That entire area is sensitive. You could easily cause irritation just from switching cleansing products, or wearing uncomfortable areas.
STIs: Infections can cause redness and irritation.
Do you have any other symptoms besides redness? If it's still red, you should go to the doctor.
I mean the part below the clitoris is red.....why is that?
There isn't really anything above your clitoris... your urethral opening (where your urine comes out) is below your clitoris. What part is red?