Topical sunscreens should be used but do not afford significant protection. Exposure to sun reverses effects and causes repigmentation. Absorption from skin and potency depend on modifications to the drug structure, vehicle of application, and condition of exposed skin. Limit sun exposure. An outbreak of phototoxic dermatitis due to limes.
Possible culprits go far beyond poison ivy.
Severe phototoxic burn following celery ingestion. Contact dermatitis due to Euphorbia pulcherrima Willd, simulating a phototoxic reaction. Contact and photocontact allergy to psoralens. Medicine is a constantly changing science and not all therapies are clearly established. New research changes drug and treatment therapies daily.