Pityriasis rosea is a rash that usually begins as a large circular or oval spot on your chest, abdomen or back. Called a herald patch, this spot can be up to 4 inches (10 centimeters) across.
The herald patch is typically followed by smaller spots that sweep out from the middle of your body in a shape that resembles drooping pine-tree branches.
Pityriasis  rosea can affect any age group. It most commonly occurs between the ages of 10 and 35. It usually goes away on its own within 10 weeks. Pityriasis rosea can cause itching. Treatment may help relieve the symptoms.
Causes--The exact cause of pityriasis rosea is unclear. Some evidence indicates the rash may be triggered by a viral infection, particularly by certain strains of the herpes virus. But it's not related to the herpes virus that causes cold sores. Pityriasis rosea isn't believed to be contagious.
Symptoms--Pityriasis rosea typically begins with a large, slightly raised, scaly patch — called the herald patch — on your back, chest or abdomen. Before the herald patch appears, some people experience headache, fatigue, fever or sore throat.
A few days to a few weeks after the herald patch appears, you may notice smaller scaly spots across your back, chest or abdomen that resemble a pine-tree pattern. The rash can cause itching, which is occasionally severe.
Complications-Complications of pityriasis rosea aren't likely. If they do occur, they may include:
·         Severe itching
·         On dark skin, lasting brown spots after the rash has healed

Homoeopathic medicines are affective for Pityriasis rosea and cure completely without any side effects. Some of the important medicines are given below-
RHUS TOXICODENDRON 30-Rhus tox is one of the best remedies for Pityriasis rosea . It is prescribed when there are red swollen eruptions  with intense itching. There is burning eczematous eruptions with tendency to scale formation.
BORAX 30-Borax is another best remedy for Pityriasia rosea. Here the skin is unhealthy with erysipelatous inflammation with swelling and tension. There is much itching and stinging pain.
ARSSENIC ALBUM 6—Arsenic alb is prescribed when itching, burning, swellings are present. It is worse from cold and scratching. Great anxiety and restlessness are other leading symptoms. Arsenic alb has a peculiar thirst for small quantities of water at short intervals.
NATRUM ARSENICUM 6-Natrum ars is another best remedy for Pityriasis rosea. It is prescribed when red spots appear under thin white scales with much itching. Warmth and exercise makes itch worse.
RADIUM BROMIDE 6-Radium bromide is prescribed where fiery red spots appear with severe burning and pain.

RHUS VENENATA 3-Rhus venenata is prescribed when erysipelaous skin appear with much itching relieved by hot water. The skin is dark red in colour.
TELLURIUM 1000—Tellurium is effective for Pityriasis rosea when ring shaped lesions appear with offensive odour from the affected part.

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