Tea tree oil helps against pimples in two key ways, as highlighted in the provided text:

1. Antibacterial Action: Pimples often become inflamed due to the presence of bacteria that thrive in the sebum trapped within blocked pores. Tea tree oil possesses antibacterial properties that directly target and combat these bacteria. By reducing the bacterial load, tea tree oil helps to prevent the infection from worsening and aids in the healing process of existing pimples.

2. Anti-inflammatory Effect: The inflammation associated with pimples causes redness, swelling, and pain. 1 Tea tree oil's anti-inflammatory properties work to soothe this irritation. By reducing inflammation, tea tree oil can help to alleviate the discomfort and appearance of pimples, making them less noticeable and promoting faster recovery.