Warm compress is the most effective way to stop a pimple from getting bigger. Apply a warm compress directly on the budding zit several times a day. If you don’t have medical grade warm compress at hand, just wet a towel in hot water and use it to warm the pimple. The warm temperature prevents further inflammation and stops the pimple from becoming a full blown embarrassment. If you are lucky, your worry will shrink to nothing in a day or two.
This is also the safest way to treat a pimple because it has no side effect. Just dab a warm towel to your face a few times a day (in my case I do it for as often as I can) and pray that it works. If it doesn’t then you just wait for the pimple to die its natural death. What you definitely don’t want to do is to put all kinds of medication on it and risk severe redness and swelling if something goes wrong.