To help reduce the appearance of a pimple overnight, you can try the following steps:

1. Cleanse the skin: Wash your face with a gentle cleanser to remove dirt and oil that can contribute to breakouts.

2. Apply an acne spot treatment: Use a product containing benzoyl peroxide, salicylic acid, or tea tree oil to target the pimple directly. These ingredients can help reduce inflammation and kill bacteria.

3. Use a cold compress: Applying a cold compress can help reduce swelling and redness associated with the pimple.

4. Avoid picking or squeezing: As tempting as it may be, avoid picking at the pimple as it can lead to further inflammation and scarring.

5. Keep your skin hydrated: Use a non-comedogenic moisturizer to keep your skin hydrated without clogging pores.

Please note that while these steps may help reduce the appearance of a pimple overnight, it’s not guaranteed to make it disappear entirely. Additionally, if you have a severe acne problem or persistent skin issues, it’s recommended to consult a dermatologist for proper evaluation and treatment.