Please choose the correct ending to complete the given sentence: Youth: [header] How to stop a pimple from forming [title] Don't try to pop your pimple. [step] If you see a pimple forming, do not squeeze it or try to pop it. Squeezing can actually push the infected material deeper into the skin, worsening the pimple and causing it to become more red and inflamed.

Ending1: [substeps] If you do have a pimple, pain will often run through it while you keep rubbing at it. The pimple will most likely not come out on its own and will require emergency medical attention. Ending2: However, pushing or popping might damage your pimple permanently, meaning it could only burst in a few weeks. [title] Use cornstarch to help remove the pimple. Ending3: Taking measures to prevent or avoid pop-pimples is recommended. [substeps] Stop popping pimples when the pus is trapped at the center. Ending4: It is also more likely to result in permanent scarring if you pick at it. [title] Apply a warm compress to an area that is sore and may be breaking out.

Answer format: ending1/ending2/ending3/ending4