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Updated: Feb 14, 2026

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Phytophotodermatitis related to carrot extract-containing sunscreen.

S S Bosanac, A K Clark, R K Sivamani1

  • 1Department of Dermatology, University of California Davis, Sacramento, California, Department of Biological Sciences, California State University Sacramento, Sacramento, California. raja.sivamani.md@gmail.com.

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Summary

Phytophotodermatitis, a skin reaction to plants, can cause various lesions. This case highlights a unique presentation after using carrot extract sunscreen, resulting in a distinct hyperpigmented patch.

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Area of Science:

  • Dermatology
  • Photobiology
  • Toxicology

Background:

  • Phytophotodermatitis is a phototoxic skin reaction caused by contact with plants or their extracts.
  • It can manifest as burning, erythema, vesicles, bullae, or hyperpigmented patches, often in unusual patterns.
  • Diagnosis relies on identifying plant exposure, occupation, and hobbies.

Observation:

  • A patient presented with a hyperpigmented patch on the skin.
  • The patch exhibited a geometric distribution.
  • Pigmentation was accentuated within the skin's natural lines (dynamic rhytides).

Findings:

  • The patient's condition was linked to the use of a sunscreen containing carrot extract.
  • This represents a specific instance of phytophotodermatitis induced by a cosmetic product.
  • The presentation included unusual hyperpigmentation in a geometric pattern.

Implications:

  • Highlights the potential for plant-derived ingredients in cosmetics to cause phototoxic reactions.
  • Emphasizes the importance of detailed patient history, including product use, for diagnosing phytophotodermatitis.
  • Suggests that phytophotodermatitis can present with distinct patterns, aiding in diagnosis.