Erythema infectiosum or Fifth Disease ~ Fifth disease, also known as erythema infectiosum, or slapped cheek syndrome, is an infectious disease caused by parvovirus B19. During incubation(10 days), the patient is contagious and may display a number of ailments: mild fever, runny nose, headache, sore throat, joint pain, etc. An erythema (rash) then appears on the cheeks before spreading to the limbs, the torso, and the buttocks. These symptoms fade spontaneously after 10 days.
Jock Itch or Tinea Crurisis is a stinging rash that appears in the groin. It can spread to the buttocks and inner thighs, if left untreated. Though it mostly affects men, women are also not immune to this annoying problem.