Haven't seen any suggestions from anyone on what has actually helped them, and I think it's badly needed. Isn't that why we're all on this site: to get help? Anyway, here's my contribution (and I'm not in any way affiliated with this company or product).
I use (Lots of) Nexcare Gentle Paper Tape in TAN color. It matches my skin extremely well so I can cover the scabs I keep picking, and can disguise these scabs and open wounds and yes, scars from picking, and still go out in public, feeling a little more confident.
If I keep the scabs covered, it allows them to get a chance to heal. Just feeling the tape reminds me not to pick, because I often do it unconsiously. The tape stays on for days (provided I don't pick them off!) even through showers and swimming, but also pulls off easily and painlessly when I need it to, w/o leaving any sticky residue. I can also adjust the size of the tape used if I want to cover a larger area (of several picked scabs close together): it comes on a tape dispenser.
I first found it in my drugstore, but then they stopped carrying the tan color. I've ordered it twice from 3M directly, which is easiest for me, buying 6-8 rolls at a time. (I keep one roll in my purse, and one in the bathroom, and one near me in the house at all times so I can slap on a bit of tape as soon as I'm tempted to pick.) Each roll is 8 yds. long, so they really do last a long time. (@ $4.99 each?)
I tried the website but didn't see it listed although 3M rep. had emailed me that it was. So I called them and that rep. couldn't find it either. They may have corrected this lapse so check out www.shop3M.com yourself, or call 800-537-2191. The UPC (for the white version tape anyway) is 51131 66992. Again, it's 3M Nexcare gentle paper tape, in tan. Hope it helps you too.