Skidancer

Hi, New to the Forum so i'd like to start by saying Hello! My issue is 5 months ago I had fitted oak skirting and architrave to my living room and hallway. Now it is turning black in both locations. I live in a bungalow with concrete floors and have saw no previous signs of damp. The carpets are dry as is the wallpaper fitted in the living room. My question is what is the problem and how can i address it? Looking forward to hearing your reply's, Will