I recently had a doctor asking me about my rash (went to see the doctor for something completely different), and in my embarrasment I just said it was due to allergies.

Yup that happened to me, so embarrassing, I said I had been bitten badly by nats!

Because I used to do it without thinking, in the end I put load of plasters on the spots so when I touched the plasters it reminded me not to pick. Took a long time, but it sorta worked. I only pick now when I'm extra stressed.
Its a form of self harm.