I got most of my acne scars by picking at pimples (fairly harshly to be fair) and then picking the scabs. I've got a lot less scarring ever since i stopped picking at inflamed spots (unless there is a clear whitehead, in which case I do it as gently as possible) and whenever there is a scab, leaving it alone. So please, if you don't want acne scars and I'm sure you don't, do not pick your skin.
However, sometimes if you have picked an inflamed spot, I've found that it's best for healing skin if you can avoid a scab to begin with, as scabs aren't really that useful for healing. So now if I have picked at something, I put a hydrocolloid bandage on it right after picking and keep it on for one night - this is usually enough to prevent a scab and it heals nicely (with a bit of flaking skin for a few days though, which you could prevent by having the bandage on for longer). Another good thing to do is moisturising - either the picked skin or the scab.