PI-WIKI-BIO-33 · Applied Biology · reviewed 2026-10-27
Aftercare Formulation Chemistry and Moist Wound Healing
Critical numbers
Founding moist-healing evidenceWinter 1962, porcine superficial wounds: occlusive film epithelialises faster than scab [1]
Modern moist vs dry conclusionMoist and wet environments promote re-epithelialisation and reduce scar formation vs dry [2]
Functional ingredient classesOcclusive, humectant, emollient, active. Petrolatum is the reference occlusive [3]
Application timingOn damp skin, not dry skin, to maximise hydration gained [3]
Documented moisturiser adverse effectsSensory irritation, allergic contact dermatitis, non-immunologic contact urticaria [3]
Lanolin sensitisationRare on healthy skin, higher risk on inflamed skin; ACDS Allergen of the Year 2023 [4, 14]
Essential oil / fragrance reactivity18.6% of 62,354 patch-tested patients reacted to at least one fragrance marker or essential oil [5]
Missed by a fragrance screen1.4% reacted to an essential oil while negative to all three fragrance markers [5]
Oxidised tea tree oil0.3% prevalence (North American arm only), but 45% of that arm's essential-oil-only reactors; 52.4% definite or probable relevance [5]
Aloe vera evidence base7 randomised trials, 347 participants, no high-quality evidence of benefit [6]
Aloe vera harm signalSurgical wounds by secondary intention: healing delayed by a mean of 30 days (95% CI 7.59 to 52.41) [6]
DexpanthenolSignificantly accelerated barrier repair and reduced erythema after SLS irritation vs vehicle [7]
Do not
- Recommending a tea tree oil product to a healing piercing
- Stripping lanolin from a recommendation to avoid an allergy that is rare
- Treating aloe vera as an active
- Applying a heavy occlusive to a surface or dermal piercing
- Recommending a skin emollient for an oral piercing
- Applying product to dry skin rather than damp skin
Applicable standards
- EU / UK — Regulation (EC) No 1223/2009 on cosmetic products governs aftercare creams
- United States — FDA does not pre-approve cosmetic products or ingredients
- ASEAN / AP — Cosmetic notification regimes in the region follow the ASEAN Cosmetic…