Psoralens may not be primarily involved in this mechanism of injury. A phototoxic reaction can result from contact with specific plant via ingestion or skin exposure followed by exposure to sunlight. Symptoms usually occur within 24-48 hours following sunlight exposure. Symptoms frequently are described as burning pain. PPD can occur through ingestion of the plant or, more commonly, through topical contact.
Clinical presentation is delayed and systemic clearance of psoralens is complete.
Avoid sun exposure. In most cases, history identifies plant exposure. Treat inflammatory condition based on severity of symptoms. Severe reactions may require systemic steroids. Consultation with a dermatologist may be helpful.