Please choose the correct ending to complete the given sentence: Youth: [header] How to use lemon juice in your beauty routine [title] Use lemon juice to remove blackheads if you have combination or oily skin. [step] Slice a lemon in half, remove the seeds and rub it in a circular motion around problem areas on your face. Wait five minutes and rinse with cold water.

Ending1: Use lemon juice all over your face in a face-to-face cleansing routine. [title] Use lemon juice to wash pimples. Ending2: [substeps] Lemon juice's high acid content and antibacterial properties can treat inflammation and help dissolve blackheads. Avoid this treatment if you have dry and sensitive skin, since a lemon's acid can cause redness and remove oil from the skin. Ending3: Repeat this three times a day while maintaining strict hygiene. [substeps] If you have oily skin, drink enough juice to cover your blackheads. Ending4: [substeps] Lemon juice can leave acne scars, so don't use it on combination skin. [title] Use lemon juice to gently wash your face.

Answer format: ending1/ending2/ending3/ending4