Pityriasis Rosea Causes

What are Pityriasis rosea causes ?

        Although this is a very common disease, so far there is no one definitive answer for the causes. In fact, the vast majority of dermatologists believe that this disease should be some kind of human infection, caused by a skin reaction. This is mainly because some of the following inferences like:
1. Diseases are seasonal, usually a few months a year there will be a particularly large number of patients.
2. Many patients prior to the onset of the skin has a number of flu-like symptoms.
Pityriasis rosea typical rash appears first on the chest, stomach or back. In the next 12 weeks, on the patient's trunk and proximal limbs, will appear one after another pink erythema. Because of the rapidity of spreading this can be alarming.

        The various attempts made to find a cause to Pityriasis Rosea allowed to isolate several infectious agents:
1. The mycoplasma.
2. The picovirus.
3. The human herpes virus type 7.