Closed Comedones, Underground Bumps
Skin-colored, flesh-toned bumps that don't go away. Closed comedones are persistent, but the protocol is well-defined.
What they are
Closed comedones are non-inflammatory acne lesions formed when sebum and dead keratinocytes plug a follicle while the follicular opening remains closed. They appear as small, skin-colored or slightly raised, persistent bumps, typically on the forehead, around the mouth, on the cheeks. Unlike whiteheads (which have pus), closed comedones have no visible head and no inflammatory component.
Why they are persistent
The underlying issue is follicular hyperkeratinization, keratinocytes inside the follicle aren't shedding properly. Without a way for the contents to reach the surface, the plug remains. Aggressive squeezing rarely works and frequently turns closed comedones into inflammatory papules.
What research supports
- Topical retinoids, adapalene 0.1% over-the-counter, tretinoin prescription; the strongest evidence.
- Salicylic acid 0.5–2%, lipid-soluble, dissolves the plug.
- Glycolic acid or lactic acid in moderation, surface exfoliation support.
- Azelaic acid 10–20%, anti-comedonal and anti-inflammatory.
- Niacinamide 4–5%, adjunct.
- Avoiding occlusive cosmetic ingredients (e.g., isopropyl myristate) that may worsen comedogenesis.
Lifestyle factors
- Reducing heavy occlusive products in affected areas.
- Cleansing makeup thoroughly at night.
- Considering whether hair products are contacting comedone-prone areas (pomade acne).
Timeline
Retinoid-based protocols typically show measurable improvement at 8 to 12 weeks with peak effect at 6 months. Closed comedones are slow to resolve, research suggests consistency over months, not weeks, is what works.
Sources
- Zaenglein AL et al (2016). Guidelines of care for the management of acne vulgaris.
- Thiboutot D et al (2009). New insights into the management of acne.