http://www.newsweek.com/parasite-larvae-skin-rash-swimmers-itch-lake-eufaula-oklahoma-texas-1722196

Swimmers in Lake Eufaula in east Oklahoma have reported the appearance of strange red rashes all over their bodies, which the the Oklahoma Department of Environmental Quality (ODEQ) has said is likely a condition called "swimmer's itch."

Swimmer's itch is also known as cercarial dermatitis and is caused by swimmers in bodies of water having an allergic reaction to microscopic parasite larvae present in the water.