Please choose the correct ending to complete the given sentence: Youth: [header] How to pop a pimple [title] Pop whitehead pimples. [step] Whitehead pimples have usually been around for a few days, and they have a white tip where pus has collected underneath the skin. These pimples are easy to pop, and when treated with care they can be safely removed without spreading the infection or causing scarring.

Ending1: This procedure can help deep drain whiteheads and clear the pimple surface. [substeps] Boil a lemon and a cup of boiling water and strain the juice out. Ending2: This method will not only stop the pimple, but keep it up for about two weeks, usually seven to eight days. If you choose not to pop the pimple, take a quick shower to keep it out of your skin. Ending3: To pop a pimple, follow a similar procedure but do it under the microscope first. It's important to remember that pimple popping doesn't mean you don't have pimple's yet. Ending4: [title] Don't pop new pimples. [step] Pimples that have just appeared in the past day or two aren't ready to pop yet.

Answer format: ending1/ending2/ending3/ending4