Sap and Sun: A Case of Phytophotodermatitis

Area of Science:

• Dermatology
• Botany
• Toxicology

Background:

• Phytophotodermatitis is a phototoxic skin reaction.
• It results from contact with photosensitizing plant compounds followed by UV-A radiation exposure.
• This reaction can cause significant discomfort and blistering.

Observation:

• A case of phytophotodermatitis occurred in a hiker in Colorado.
• The reaction was attributed to exposure to cow parsnip (Heracleum maximum).
• The patient presented with a burning, painful rash consistent with phytophotodermatitis.

Findings:

• Cow parsnip contains phototoxic substances that trigger this reaction.
• The rash is characterized by erythema, pain, and often blistering.
• Treatment is primarily supportive, focusing on wound care, pain relief, and anti-inflammatory measures.

Implications:

• Medical providers should consider phytophotodermatitis in the differential diagnosis of blistering rashes.
• Awareness of plants causing phytophotodermatitis is crucial for prevention.
• Public education on avoiding offending plants and immediate skin washing after contact is recommended.