Bite from an insect (bug).

Jaundice means the skin has turned a yellow color. Bilirubin is the pigment that turns the skin yellow.

Sting from a jellyfish. Jellyfish cause most of the stings that occur in sea water. The main symptoms are pain, burning and redness at the sting site. Red lines are common.

Fungus infection and rash of the groin and inner, upper thighs. Jock itch is also called ringworm of the crotch