Potentially Hazardous Asteroids (PHAs) are space rocks larger than approximately 100m that can come closer to Earth than 0.05 AU. None of the known PHAs is on a collision course with our planet, although astronomers are finding new ones all the time. On April 16, 2017 there were 11 potentially hazardous asteroids.
Radiation therapy is often delivered from a machine outside the body. One of the most common side effects is a skin condition called radiation dermatitis, which can range from a mild, red rash (erythema) and itchy, peeling or flaking skin (dry desquamation) to a more severe reaction with blisters and wet, peeling skin (moist desquamation).
Bullous pemphigoid (BP) is a skin disease that causes blisters. It mainly affects people aged over 70. Treatment usually works well to control symptoms. Treatment is usually with steroid creams or medicines, but sometimes other medicines may be used. The condition tends to go away after 1-5 years and then treatment can be stopped. Sometimes the disease persists and treatment is needed long-term. BP is a skin condition that causes blisters. In some cases the condition becomes severe and serious. Note: several skin conditions cause blisters and it is important to know exactly which disease you have. They have similar sounding names-for example, pemphigus vulgaris and other types of pemphigus.