Trichotillomania has been found to be associated with mood disorders, particularly bipolar disorder. Trichotillomania has shared similarities with bipolar disorder by virtue of phenomenology, co-morbidity, and psychopharmacologic observations. In the past, trichotillomania with comorbid bipolar disorder was treated with lithium and sodium valproate. There has been little, if any, literature on using asenapine to augment treatment in patients with trichotillomania with comorbid bipolar disorder. A patient presented with hair-pulling episodes for a year, resulting in bald scalp patches. She had no mood symptoms prior to this. She developed low mood, anhedonia, poor sleep and poor appetite subsequently as she could not stop pulling her hair. She was started on escitalopram 10 mg daily for he depressive symptoms. Three years later, she developed hypomanic symptoms such as irritability and spending sprees. Her hair pulling behaviour worsened at this time. At this point, a diagnosis of bipolar disorder type 2 was considered and she was started on lithium 300 mg daily. Her escitalopram was discontinued. As her mood was still labile 10 months later, asenapine was added to augment lithium in the treatment of the bipolar disorder. With asenapine, her hair pulling frequency started to decrease rapidly. Asenapine was increased to 10 mg daily and her hair pulling ceased. Her mood also stabilized and she no longer had erratic periods of mood lability. In conclusion, asenapine augmentation of lithium has potential to be used in patients who have trichotillomania with comorbid bipolar disorder due to its unique receptor profile.