what is this technique in photography called?

i remembered that a long time ago i saw a photo on flickr. the girl took the picture of herself and it was normal brightness but then a random streak of red appeared. i dont think the photo was processed but i think she used an old camera or something? it appeared in a random spot where (im not sure if its right but the light bled through or something?)
anyway it wasnt a normal mishap either because she has many photos of the same thing
thanks!

Most likely the seal on the camera has developed a light leak that is allowing a streak of light to overexpose part of the image when the light strikes the camera at a certain angle.