Glossary
Phototoxicity is a sun-sensitivity concern that can happen when certain essential oils are applied to skin and then exposed to sunlight or UVA light.
What Phototoxicity Means
Some essential oils contain natural compounds that can increase the skin’s reaction to UV exposure. This is most often discussed with certain cold-pressed citrus oils. A phototoxic reaction can be more serious than ordinary irritation and may involve redness, burning, blistering, or discoloration.
Why It Matters
Phototoxicity is method-specific. It is mainly a concern for leave-on topical products used before sun or tanning bed exposure. Diffusing a citrus oil is not the same as applying it to skin before going outside. The oil, extraction method, dilution, and product type all matter.
Example in Essential Oil Use
Cold-pressed bergamot essential oil is a classic phototoxicity example. FCF or bergapten-free bergamot is often preferred for leave-on skin products because it has been processed to reduce this concern.