Microneedling (percutaneous collagen induction) creates controlled microtrauma at 0.5–2mm depth, triggering a wound-healing cascade that increases collagen I and III synthesis by up to 400% at the treatment site. For Indian acne scarring — the most common post-acne sequela in Fitzpatrick III–V — this represents the highest evidence-level non-ablative intervention.
Rolling atrophic scars (the most common type in Indian skin) respond to CIT because the mechanical stretching of fibrotic scar tissue plus the collagen-induction effect simultaneously. 12-session protocols at 4-week intervals showed 72% reduction in scar depth via confocal imaging. Crucially, properly performed CIT does not trigger post-inflammatory melanocyte activation, unlike laser or chemical peels.
PIH after microneedling occurs in 28% of cases when performed by undertrained practitioners (needle depth >1.5mm, excessive passes). Correct protocol for Indian skin: Fitzpatrick IV–VI requires mandelic acid pre-treatment for 4 weeks, 1mm maximum needle depth, anti-inflammatory post-care (niacinamide, centella), avoid sun for 2 weeks post-session. SPF 50+ mandatory throughout. With correct protocol, PIH incidence drops to <4%.
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