That hole is an ice-pick scar from popping deep enough to rupture the follicle wall. Collagen does not refill the divot on its own. Cover any future pop immediately with a hydrocolloid patch like Hero Mighty Patch or COSRX for 12 hours. The patch absorbs fluid and keeps the wound moist. Dry scabs scar harder. Skip benzoyl peroxide and retinol on the open spot for 48 hours. For existing scars, the options are TCA CROSS in-office, microneedling with PRP across 3 to 6 sessions, or fractional CO2 laser. Stop popping cysts. Surfaced whiteheads under a patch close without a crater.