Second Skin

One night to survive. One soul to save. When five friends break into an abandoned house, they expect to find dust and old furniture. Instead, they find themselves caught in a terrifying trap. After a séance gone wrong, a primal, bloodthirsty spirit takes root in their friend, and the teens find themselves trapped in a house of horrors with a predator that is evolving. As the moon climbs higher, the human part of Jared begins to fade, replaced by a hunger that can't be satisfied. With every exit barred, the group tries desperately to escape the beast their friend is becoming.

[There is a longer version of this horror short with a different ending called “The Board.” You can find it in the book “The Barrow, The Board, and The Bunny: Three Short Tales of Horror.”]