A flush valve is a mechanism used to flush a toilet or urinal. The valve and associated hardware are located within the toilet tank or in the body of the urinal. Most toilets have a lever or push button activator, which is used to operate the flush valve.
Photosensitivity (or sun sensitivity) is inflammation of the skin induced by the combination of sunlight and certain medications or substances.This causes redness (erythema) of the skin and may look similar to sunburn.hotosensitivity (or sun sensitivity) is inflammation of the skin induced by the combination of sunlight and certain medications or substances.
Sun Allergies and Symptoms. Sometimes, when the skin is exposed to the sun, one gets a sun allergy (photosensitivity), which is a reaction of the immune system to the sunlight. Following are the most common types of sun allergies: Solar Urticaria: One gets large itchy red bumps in solar urticaria.fter sun exposure, one develops a skin rash, chills, headache, and nausea. Polymorphous Light Eruption (PMLE) : In this allergy, one experiences white itchy bumps on skin after exposure to sun. There is also redness, burning, blistering, and swelling in PMLE.