The rule of thumb: do not pick at pimples. A known fact but often ignored. Dealing with Acne can be tedious but the aftermath of picking at them is a lot harder to reverse. The severity of the lesions would impact the type of scarring. If it's minor and the rupture occurs near the surface, the skin should heal quickly. However, in more serious cases, there might be damage done to the follicle wall, destroying healthy tissues.
In order to treat the damaged dermis, the skin forms new collagen fibers but this natural "fix" usually does not heal flawlessly thus leading to what we know as Acne Scars. Nipping the problem in bud is one of the best solutions so first and foremost, treat acne before the scars appear.