In which episode of House MD does have a cold?

House MD never explicitly shows House having a cold. This is intentional as part of his character's persona. He is shown to be perpetually grumpy and unhealthy, but a cold would be a minor ailment for him and wouldn't fit his personality.

However, there are episodes where House shows symptoms that could be interpreted as a cold, such as:

* "The Mistake" (Season 1, Episode 14): House coughs and sneezes while examining a patient.

* "Deception" (Season 2, Episode 2): House is seen coughing and taking medicine in this episode.

But it's important to remember that House is known for not taking care of himself and his symptoms could be attributed to his general poor health rather than a specific cold.