Skip to content

Skin Problems & Treatments Health Center

Font Size

Bleeding or Clotting Disorders That Cause Bruising

When you cut or injure yourself, your body uses special blood cells, called platelets, and other chemicals, called clotting factors, to form a blood clot and control your bleeding. Bleeding disorders sometimes occur when the platelets or clotting factors are not working properly and do not form clots. Bleeding or clotting disorders include:

  • Disseminated intravascular coagulation (DIC), a condition that comes on quickly. Small blood clots form and move through the bloodstream, blocking small blood vessels and using up the clotting factors that are needed to stop bleeding. Emergency treatment is needed to stop bleeding and save the person's life.
  • Idiopathic thrombocytopenic purpura (ITP, also known as primary or autoimmune thrombocytopenic purpura), a disorder in which a low platelet count causes abnormal bleeding. The cause of ITP in adults is not known. In children, ITP may be an autoimmune disease that is triggered by a viral infection. Symptoms include red spots on the skin, unexplained bruises, bleeding from the gums and nose, and blood in the stool. The condition may appear suddenly or gradually.
  • Thrombocytopenic purpura, a rare disorder in which small blood clots form throughout the body, leading to a sharp drop in the number of platelets and red blood cells. Symptoms develop suddenly and include fever, bruising, belly pain, blood in the urine, and an irregular heartbeat. A person who has symptoms of thrombocytopenic purpura needs emergency treatment.
  • Hemolytic uremic syndrome, a serious and often fatal disorder in which the number of platelets suddenly drops, red blood cells are destroyed, and the kidneys stop working. The cause is not known, but the syndrome may be triggered by a bacterial infection or medicine use.
  • Henoch-Schonlein purpura, also known as allergic purpura, an inflammatory disease of the small blood vessels that most often affects children. The cause is not known, but it may be the result of an autoimmune disease or a severe allergic reaction. Symptoms may include sudden headache, fever, loss of appetite, abdominal cramping, joint pain, and bruising. Abnormal bruising is most often seen in the lower legs.

By Healthwise Staff
Primary Medical Reviewer William H. Blahd, Jr., MD, FACEP - Emergency Medicine
Specialist Medical Reviewer H. Michael O'Connor, MD - Emergency Medicine
Current as of March 12, 2014

WebMD Medical Reference from Healthwise

Last Updated: March 12, 2014
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

Today on WebMD

Pictures and symptoms of the red, scaly rash.
woman with dyed dark hair
What it says about your health.
woman with cleaning products
Top causes of the itch that rashes.
atopic dermatitus
Identify and treat common skin problems.
itchy skin
shingles rash on skin
woman with skin tag
Woman washing face

Itching for Relief?

Get Help With the

Loading ...

Sending your email...

This feature is temporarily unavailable. Please try again later.


Now check your email account on your mobile phone to download your new app.

woman washing her hair in sink
close up of womans bare neck
woman with face cream