Final answer:
Pityriasis rosea is a viral skin condition that causes a pink or red rash. It usually affects teenagers and young adults and resolves on its own within a few weeks.
Step-by-step explanation:
Pityriasis rosea is a common skin condition that usually affects teenagers and young adults. It is characterized by a pink or red rash that starts on the trunk and spreads to the arms, legs, and neck. The exact cause of pityriasis rosea is unknown, but it is believed to be caused by a viral infection. Diagnosis is usually made based on the appearance of the rash and sometimes confirmed with blood tests. Treatment is focused on relieving symptoms and the condition usually resolves on its own within a few weeks.