Irritation is not a skincare ingredient but a non-immunologic adverse skin reaction, typically presenting as redness, stinging, burning, or dryness in response to topical agents. It is often dose- and concentration-dependent and distinct from allergic contact dermatitis.
| Reported effect | How often | Notes |
|---|---|---|
| Erythema (redness) | Common | Most frequent visible sign, often transient and localized to application site. |
| Stinging or burning sensation | Common | Especially with actives like retinoids, acids, and vitamin C; may occur without visible signs. |
| Dryness and flaking | Common | Barrier disruption from surfactants or exfoliants. |
| Itching (pruritus) | Uncommon | Can overlap with allergic responses; usually subsides on discontinuation. |
| Cumulative irritant contact dermatitis | Uncommon | Develops with repeated exposure over time rather than single contact. |
| Vesiculation or weeping | Rare | Seen with strong irritants or high concentrations. |
| Post-inflammatory hyperpigmentation | Rare | More likely in darker skin phototypes following prolonged irritation. |
| Chemical burn | Very rare | Associated with misuse of high-strength acids or peels. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.