Pityriasis rosea is an unexplained acute inflammatory skin disease, the majority of scholars believe that the disease and virus infection, s
Pityriasis rosea is an unexplained acute inflammatory skin disease, the majority of scholars believe that the disease and virus infection, such as Coxsackie virus, virus and so on have had, associated with streptococcal infection. Clinical manifestations of lesions characteristic, condition or self limiting.
The disease is more common in young people. Good hair in the spring and autumn season, some patients before the onset of a varying severity of upper respiratory tract infection symptoms, such as headache, sore throat, fever, malaise, muscle aches, joint discomfort, with neck, armpit lymph node enlargement etc.. The initial lesion is the presence of an isolated 2cm ~ 3cm or more rose red patches, covered with thin scales, known as the precursor spot or mother spot, can occur in the trunk, such as the abdomen, back, armpit etc., can also occur in the proximal limbs, such as the upper arm, shoulder, lock bone etc.. 1 to 2 weeks later, in the neck, trunk and limbs of the proximal trickle size range of many red patches, and mother spot shape is similar, but smaller, about 0.2cm ~ 1cm size, usually oval, the edge covered with collar shaped, thin scales free edge inward, long axis in general parallel, and Dermatoglyphics clear boundary, were concentric symmetrically, scattered or dense, rarely fusion. Continued from January to February. Often accompanied by varying degrees of itching. The course of disease is generally 4 weeks to 8 weeks, generally from the skin lesions in the central subsided, and the edge subsided later, can form a ring, the color is light brown. There are several months or even years, the majority do not relapse after healing.
Of course, there are some special types of pityriasis rosea: if only mother spot, after no spot, called "unsymptomatic"; such as rash exudation tendency obvious, often itching, called "exudative"; in addition, vesicular papules, pustules, urticaria, purpura type, erythema multiforme, and rash to the head and face, the distal end of extremities.
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