From Beneath (2012)

Jason, is bit by a strange organism while on vacation with his girlfriend, Sam, at her sister's secluded farmhouse. The bite begins a transformation in Jason, and now the couple must race against time to figure out what happened to Sam's sister and her family, and what lies in store for them. All of these elements are tantamount to the ultimate fear addressed in the film, the fear of losing a loved one and worse, becoming a monster in their eyes. 

It's growing inside of you! Sticky and hot from the long drive to visit a relative at their newly acquired, remote, rural farmhouse, Sam and Jason, a young couple on vacation, decide to swim in a pond they find at the end of a freshly cut path. While swimming, Jason is bitten by a strange leech-like organism. When he attempts to remove the creature, part of it rips off and crawls inside his leg. Back at the house, Sam's sister and her family have yet to return. As time progresses, the injury on Jason's leg worsens into a rapidly spreading infection, and strange clues begin to reveal that there may be more to their host's absence than it previously appeared. It soon becomes a race against time to discover what happened to Sam's sister and her family and what lies in store for Jason, faced with his physical and emotional disintegration.

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