What Causes Vaginal Redness?

I went to the doctor because i had a smell on me that i couldn't smell but others did, the doctor did a complete exam on me, and my vagina is all red inside but i have no yeast infection or bladder infection, she said that it was from fabric softener and asked me not use the fragrance softener would u know what the redness is? it doesn't burn nor does it itch. I am 54 years old and 5'4" and weigh 194 pounds