What is phototoxicity?

Phototoxicity refers to a skin reaction that occurs when certain substances, which can be applied topically or ingested, react with sunlight. When these substances—such as certain medications, cosmetics, or even some foods—are present in the body or on the skin, exposure to UV radiation can trigger an abnormal response. This often manifests as severe sunburn-like symptoms, inflammation, or other dermatological issues.

Option B correctly identifies that phototoxicity can result from oral, topical, and ingestible substances. It highlights the broader spectrum of how these compounds can induce reactions when combined with sunlight. Understanding this concept is important for professionals in the tanning industry, as it can inform their approach to client safety and identify potential risks associated with particular products or medications.

In contrast, the other options are too narrow or inaccurate in scope. Some imply that phototoxicity is limited to certain types of reactions or exposure, which does not encompass the full definition and context of phototoxicity.