Oral Hairy Leukoplakia - W/ Neg HIV Test

Hey,

I have had two white ridges going down the sides of my tongue for about a month now.  I just had a HIV test done and it came back negative. It has been about 3 months since I could have had any possibility of coming into contact with HIV. Is it possible for a person to show signs of OHL and get a neg result on a HIV test or does it usually only occur later in HIV disease?

Thanks!