The scientific fact – what is this lump?
Medically, it’s called a “trichobezoar” if it’s made of human/animal hair, and a “lint ball” if it’s made of lint and dust. In drains, it’s called a “drain clog” or a “sewer monster.” Why does it look like that? There are three reasons: Hair + Soap Scum: Hair sticks to pipes, and soap contains fatty acids that adhere the hair like glue. Over time, it forms a ball. Lint and Dust: From towels and clothes. When mixed with skin oils and shampoo, it forms a thick layer. Biofilm: Bacteria coat the lump with a sticky layer called a “biofilm” to protect themselves. This is what gives it its brown color and unpleasant smell. Is it dangerous? Yes, if it blocks the drain (drain blockage), the water starts to back up (backflow), and that’s what causes the smell. If left for a long time, bacteria can cause
