You definitely dont want to pick at it because that only makes it worse. The best thing to do is use a skin cream and keep you skin as clean as possible. Unfortunately pimples are a part of life and just like buses.....they come and go.
I am 37 and I still get zits sometimes. I have always popped them and have absolutly no scars at all from the ones I popped. I have a couple of reminders from the ones I just let sit there. Those ones can leave a mark.
Try a spot treatment for those terrible, painful pimples that r really swollen. They sell spot treatments at ur neighborhood drugstore for a fair price. Just put it on in the morning when u wake up, and at night before u go to bed. Before u know it, no more pimple(s)!
A paste made with salicylic and water works really good. Salicylic is just plain aspirin like Bayer. Crush the pill, make a paste with water. Apply to clean dry area. Toothpaste works good also. Keep your skin clean and exfoliate. I used to buy corn meal, wet my face, put a little water in it and gently rub it on your face to exfoliate the dead skin off. I never found a better or cheaper skin product. Apply a non greasy moisturizer, St Ives used to make a moisturizing gel, that was good to use.