Mechanism

Keratinocyte Turnover

The rate at which skin cells proliferate, differentiate, and shed; accelerated in psoriasis.

Review

What it is

In healthy skin, keratinocytes mature from the basal layer to surface in roughly four weeks.

In psoriasis, immune-driven signaling shortens this dramatically, producing immature corneocytes that scale prematurely and form plaques.

Turnover is a central node in psoriasis biology and in retinoid and AHA discussion.

Visible thickened, often silvery surface layers from accelerated, disorganized turnover.

Adaptive and innate immune signaling that drives inflammation and shapes chronic skin disease.

Ingredient axes

Scaling / keratolytic axis

Agents (salicylic acid, urea, lactic acid) that soften and remove excess scale.

Keratinization / sebaceous axis

Vitamin A-derived agents that normalize follicular keratinization and modulate sebaceous activity.

Cell turnover axis

Glycolic, lactic, and similar acids that loosen corneocyte adhesion at the surface.