Is purpura flat or convex

Purpura is a disease that has a relatively great impact on human health and also a disease with a relatively high incidence rate. After the onset of purpura, patients will experience a variety of symptoms. Therefore, among purpura patients, some have flat skin, some have raised skin, and some even have blisters and blood blisters on their skin. Below we will introduce to you the specific symptoms of allergic purpura!

1. Skin

Most cases present with skin purpura as the first symptom. Skin lesions appear as pinpoint to soybean-sized petechiae, ecchymoses or urticaria-like rashes or pink maculopapular rashes that do not fade when pressed, which is purpura. Purpura may merge into patches and eventually turn brown. It usually disappears within 1 to 2 weeks without leaving any trace. In severe cases, blisters, blood blisters, necrosis and even ulcers may occur. The rash often occurs in weight-bearing areas, especially on the extensor side of the limbs, especially the lower limbs, around the ankle joints and buttocks. The lesions are symmetrically distributed, appear in batches, and are prone to recurrence. Only skin damage is also called simple purpura.

2. Digestive system

About 2/3 of cases present with gastrointestinal symptoms. It usually appears within 1 week of the rash. Common abdominal pain, often manifested as paroxysmal periumbilical pain and colic, abdominal pain may also occur in other parts of the abdomen. There may be tenderness, but rebound tenderness is rare. Accompanied by vomiting. About half of the children have positive fecal occult blood test, some may have bloody stools, or even vomit blood. If abdominal pain occurs before skin symptoms, it is easy to be misdiagnosed as an acute surgical abdomen or even undergo surgical treatment incorrectly. A small number of children may develop complications such as intussusception, intestinal obstruction, intestinal perforation and hemorrhagic enteritis. Patients with abdominal pain, diarrhea, bloody stools, and even gastrointestinal bleeding are also called gastrointestinal purpura.

3. Urinary system

Most cases develop gross hematuria, microscopic hematuria and proteinuria, or tubular urine 2 to 4 weeks after purpura onset. Urinary system symptoms may occur at any time during the course of the disease, and may also appear after the rash subsides or when the disease is dormant. The severity of the disease varies, and severe cases may cause renal failure and hypertension. More than half of the children's kidney damage can be cured clinically on its own. Patients with hematuria, proteinuria and renal damage are also called renal purpura.