Pityriasis rosea
Definition
Pityriasis rosea is a common type of skin rash seen in young adults.
Causes
Pityriasis rosea occurs most commonly in the fall and spring. It is believed to be caused by a virus. Although pityriasis rosea may occur in more than one person in a household at a time, it is not thought to be highly contagious.
Attacks generally last 4 - 8 weeks. Symptoms may disappear by 3 weeks or last as long as 12 weeks. There is generally a single large patch (herald patch) followed several days later by a rash.
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