Not much. If you don't see new ones, I suggest you not needle anything, since it's hard to tell the little marks left over (until they disappear) from actual mollusca.
As to contagiousness, I don't find the condition contagious in anyone--I see all ages with it, and rarely does anyone nearby have it. So in your situation, you certainly should be OK.
Best.
Dr. Rockoff
Dr. Rockoff
Dr. Rockoff