Mastic gum is a resinous exudate from Pistacia lentiscus used in skincare for its antimicrobial, anti-inflammatory, and astringent properties, and is sometimes included in formulations targeting acne or oily skin. Evidence in topical dermatology is limited, with much research focused on oral and gastrointestinal applications.
| Reported effect | How often | Notes |
|---|---|---|
| Allergic contact dermatitis | Uncommon | Reported in sensitized individuals, particularly with plant resin or fragrance allergies. |
| Skin irritation or redness | Uncommon | May occur in those with sensitive skin or at higher concentrations. |
| Cross-reactivity with other resins/mastics | Rare | Possible in individuals with known sensitivities to related natural resins (e.g., colophony). |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.