J.W.
A few things enter my mind, and the first is hormonal. Get checked out by an Integrative doctor specializing in hormones. My family's experience with most regular endocrinologists have been less than adequate (long story).
Stress can affect your hypothalamic-pituitary-adrenal axis (ie hormones) which may be gently corrected.
Then there is the question of whether your diet has changed since giving birth? Or maybe your body just can't handle foods it used to. After giving birth I found that EVERY single time we ate a high-fat beloved food at our favorite breakfast place I got a huge acne lesion. That one was direct cause and effect, yet I kept reading that food does not cause acne. Confusing, and all I can say is bunk! OK... the food didn't but my reaction to it sure did!