The etiology of pityriasis rosea is not yet clear. Academics have a variety of hypotheses such as infection (fungal, bacterial, viral), metamorphosis, etc., but there is no definite evidence to prove and infection, virus related. Many scholars propose that this disease is likely to be caused by viral infection, because this disease has seasonal episodes, the rash is self-limiting, rarely recurring, initially as a prodromal spot, and no definite metabolic substance is found to cause this disease, so most think that it is related to viral infection. It is also thought to be an allergic diagnosis of an infection or a cutaneous manifestation of gastrointestinal toxicity. From the clinical point of view, environmental humidity and low immunity and pityriasis rosea are closely related, and patients are advised to pay attention to internal and external conditioning at the same time. What are the obvious symptoms of pityriasis rosea? Many pityriasis rosea patients start lesions as red papules, can fuse with each other into patches, such patients often have severe itching, called papular pityriasis rosea. A few patients with pityriasis rosea may have systemic symptoms, especially patients with rosea-type autosensitive dermatitis, may have fever. Some patients have a rapid onset, no precursor spot, more in the lower abdomen or inner thighs appear large red patches or maculopapular rash, there is severe itching, damage quickly expanded to the trunk and limbs, these damages gradually in the central part of the crust damage, scab peeling and rose pityriasis-like lesions, such patients may be caused by home-sensitivity reaction, so called rose-type home-sensitivity dermatitis. It is worth noting that some pityriasis rosea patients have an urgent onset, the symptoms are more obvious, if not treated in time, it is easy to happen life threatening, therefore, suffering from pityriasis rosea must be treated in time to the hospital. How should pityriasis rosea be treated? Because the disease has self-limiting, so the purpose of treatment is to reduce the symptoms and shorten the course of the disease. 1. general treatment In the acute period, hot water washing and scrubbing with soap are forbidden. Antihistamines can be applied appropriately, such as paracetamol, cyproheptadine, terfenadine and ketaminergic, etc. Vitamin C can also be used. 3. UV irradiation After the acute inflammation period has passed, the appropriate use of UV spot irradiation can promote the fading of the damage. 4. Topical treatment Furfuracin lotion can be used for external application. 5. Chinese medicine treatment: Chinese herbal medicine is recommended for external washing, the effect is It is better. Warm reminder: medication treatment is for reference only, please refer to the doctor’s advice for specific treatment. What are the dietary health care measures for pityriasis rosea? Acute pityriasis rosea patients, should pay attention to eat less fish fishy hair food. Avoid eating fatty, fried food: all kinds of baked fried food such as fries, fried chicken, roast duck, roast pork, fried peanuts, French fries, smoked meat, etc.. Because these foods are hot in nature, help produce heat toxicity, easy to trigger or aggravate the disease, bringing difficulties to the treatment. For tobacco, alcohol and stimulating spices pityriasis rosea patients also use as little as possible. Such as chili pepper, pepper, garlic, onion, five spice powder, chili paste, etc.. Because these foodstuffs warm dispersal pungent dry, eat into the body hurt Yin consume blood, produce blood heat blood dry, will cause the deterioration of the disease. Acute pityriasis rosea patients can eat more carrots, carrots are helpful to improve constipation, also rich in beta-carotene, can neutralize toxins. Is pityriasis rosea contagious? Why? In fact, pityriasis rosea is not contagious. It is also not contagious through its own contact, object contact, or sexual contact. Some patients will have the question, why they have got pityriasis rosea and their family members also have got it, is pityriasis rosea also have latent infection? In fact, mainly because the cause of pityriasis rosea is related to the own body constitution, infection coxsackie group B virus, damp heat and blood stasis in the body. Patients and family members of the same living environment, eat the same food, solid may be infected with the same virus chances are greater, this is why they got pityriasis rosea, and family members also got pityriasis rosea reason, in fact is not caused by infection. How should pityriasis rosea prevent? 1, reduce access to public places, increase resistance, avoid being infected; 2, pityriasis rosea and environmental humidity has a certain relationship, need to keep the living environment dry. At the same time to understand the prevention of common sense: 1, early diagnosis, treatment of the original disease. Acute attack period should avoid all kinds of stimulation and humidity. 2.The disease is good in spring and autumn, mostly seen in young and strong people, generally 4-8 weeks can heal by itself, but need active treatment. 3. Most patients have no systemic symptoms, but headache, sore throat, low fever and swollen lymph nodes in the neck may occur.