In skincare, 'bacteria' typically refers to live probiotics, bacterial lysates, or ferment-derived ingredients used to support the skin microbiome and barrier function. Depending on the strain and form, they may help modulate inflammation and improve skin hydration.
| Reported effect | How often | Notes |
|---|---|---|
Mild irritation or redness | Uncommon | Transient, usually at application site |
Allergic contact dermatitis | Rare | May relate to the strain or accompanying formulation components |
Breakouts or worsening of acne | Rare | Reported variably; strain-dependent |
Infection in compromised skin | Very rare | Theoretical concern with live bacteria on broken skin or immunocompromised individuals |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.