It doesn't. In fact, it compliments it. The blood stains on the Sudarium of Oviedo line up with the stains on the shroud. Furthermore, they are the same blood type.
The remarkable thing about this cloth is that both tradition and scientific studies claim that the cloth was used to cover and clean the face of Jesus after the crucifixion. We are going to present and look into these claims.
Sudarium.
For a more comprehensive and scientifically researched study on Shroud of Turn, go to this link.