Pityriasis Rosea
Pityriasis Rosea is an acute, self-limiting skin condition characterized by an initial herald patch followed by a widespread rash on the trunk and proximal extremities. It commonly affects individuals aged 10 to 35 years, with a slight female predominance. The exact cause is unknown, but it is believed to be associated with the reactivation of human herpesvirus 6 or 7.
Clinically, the condition begins with a single large, scaly, pink patch (herald patch), typically on the chest, back, or abdomen. This is followed by smaller, oval, scaly patches that appear in a “Christmas tree” pattern. Some patients may experience mild prodromal symptoms such as headache, fever, or malaise before the rash appears. Diagnosis is primarily clinical, and possible differentials include tinea corporis, secondary syphilis, and psoriasis, among others. Treatment is usually unnecessary as the condition resolves on its own within 6–8 weeks. However, symptomatic management may include topical corticosteroids, oral antihistamines, and moisturizers to alleviate itching. The prognosis is excellent, with most cases resolving without complications. Recurrences are rare, but the condition can occasionally lead to prolonged skin discoloration.
References
- Villalon-Gomez JM. Pityriasis Rosea: Diagnosis and Treatment. Am Fam Physician. 2018;97(1):38-44.
- El-Hussein M, El-Tawil C, Nakhle R, Souaiby N. HHV 6-7 reactivation causing Pityriasis Rosea and labyrinthitis: A case report. Am J Emerg Med. 2020;38(9):1969.e1-1969.e3. doi:10.1016/j.ajem.2020.05.005
- Contreras-Ruiz J, Peternel S, Jiménez Gutiérrez C, Culav-Koscak I, Reveiz L, Silbermann-Reynoso ML. Interventions for pityriasis rosea. Cochrane Database Syst Rev. 2019;2019(10):CD005068. doi:10.1002/14651858.CD005068.pub3