The first and best line of defense against<unk>  is to avoid contact with phototoxic substances in the first place: * Avoid contact with the plant family Apiaceae, citrus fruits, and other biological agents known to have phototoxic effects. Do not incinerate phototoxic plants and agents since this will serve to disperse the phototoxic substances more widely. * In outdoor situations where contact with phototoxic plants is likely, wear long pants and a long-sleeve shirt. Wear gloves and protective eyewear before handling such plants. * If protective clothing is not available, apply sunscreen to exposed areas. This will provide some measure of protection if contact is made. * After an outdoor activity, take a shower or a bath as soon as possible. Wash your clothing and then wash your hands after handling the dirty clothes. A second line of defense is to avoid sunlight, so as not to activate a phototoxic substance: * If you come in contact with a phototoxic substance, immediately wash the affected area with soap and cold water, and avoid any further exposure to sunlight for at least 48 hours. Heat and moisture can worsen the skin reaction, which is why it’s important to wash the affected area with soap and cold water. * Stay indoors, if possible. Be sure to avoid light shining through windows. * If staying indoors is not an option, cover the affected area with sun protective clothing. * In lieu of sun-protective clothing, apply sunscreen to the affected areas after washing.<unk>  is triggered by long wavelength ultraviolet light (called UVA) in the range of 320–380 nanometers, so the best sun-protective clothing and sunscreen products will block these wavelengths of UVA radiation. In 2011, the U.S. Food and Drug Administration (FDA) established a "broad spectrum" test for determining a sunscreen product's UVA protection. Sunscreen products that pass the test are allowed to be labeled as "Broad Spectrum" sunscreens, which protect against both UVA and UVB rays. There is no equivalent test or FDA-approved labeling for sun-protective clothing. Some clothing is labeled with an Ultraviolet Protection Factor (UPF) but test results from Consumer Reports suggest that UPF is an unreliable indicator of UV protection.
Phytophotodermatitis
Ichthyosis acquisita
Urticaria pigmentosa
Ichthyosis bullosa of Siemens
Striate keratoderma
Poikiloderma of Civatte
Abietic acid dermatitis
Granulomatous facial dermatitis