N.D.
Absolutely. Get a referral and get someone who specializes in this. As someone who has dealt with acne for years, I know what you are talking about. It's clearly a pimple and very likely cystic. Either way, the question remains. Why is a 3-year old getting this and why is it re-ocurring?
Hope this helps. IF it were my son, I wouldn't wait any longer.
N.