Phytophotodermatitis Treatment
Phytophotodermatitis should be managed with supportive care including topical corticosteroids for inflammation, systemic antihistamines for pruritus, strict sun avoidance, and immediate wound hygiene—with severe cases requiring burn unit admission.
Immediate Management
The cornerstone of treatment is supportive care with the following specific interventions 1, 2, 3:
- Topical corticosteroids (potent formulations) applied to affected areas to reduce inflammation and pain
- Systemic antihistamines for symptomatic relief of pruritus and discomfort
- Analgesia as needed for pain control
- Wound hygiene with gentle cleansing to prevent secondary infection
Severity-Based Approach
Mild to Moderate Cases
- Outpatient management with topical corticosteroids and oral antihistamines
- Treatment duration typically 1 week 1
- Close monitoring for progression
Severe Cases
Admission to a burn unit may be necessary for extensive exposures with generalized involvement, blistering, or systemic symptoms 3. These cases can be life-threatening and require specialized wound care similar to thermal burns.
Critical Prevention Measures
Sun avoidance is mandatory during the acute phase and healing period 2, 3. Patients must:
- Avoid all UV exposure until lesions completely resolve
- Wear protective clothing (long sleeves, gloves) when plant contact is unavoidable
- Immediately wash with soap and water after any contact with offending plants—this is the single most effective preventive measure 2
Common Pitfalls
The most dangerous error is misdiagnosing phytophotodermatitis as a simple contact dermatitis or burn, leading to inadequate sun protection counseling. The characteristic streaked or bizarre-patterned lesions following plant exposure (especially fig trees, citrus, cow parsnip, or wild parsnip) should immediately trigger consideration of this diagnosis 4, 1, 2.
Do not recommend phototherapy or deliberate sun exposure—this will worsen the condition. While the provided guidelines discuss PUVA therapy 5, these apply to chronic photodermatoses like polymorphic light eruption, NOT acute phytophotodermatitis, which is a phototoxic reaction requiring opposite management.
Patient Education
Counsel patients to:
- Identify and avoid offending plants (Apiaceae, Rutaceae, Moraceae families) 4
- Understand that hyperpigmentation may persist for months after acute inflammation resolves
- Recognize that this is a phototoxic (not allergic) reaction, so re-exposure with UV light will cause recurrence