-Henoch-Schonlein purpura.

Allergic purpura
Anaphylactoid purpura
(Henoch-Schonlein purpura)

(Purpura on the right lower leg of a child)

-Def:- is an allergic disorder in which the allergic reaction occur in the
wall of blood vessels in "JARS"

• Joints
• Abdomen(GIT)
• Renal(kidney)
• SKIN

-Aetiology:- (Antigen)
1-Infection.
2-Food or drug allergy.
3-Insect bite.

-Symptoms:-

• Purpura, arthritis and abdominal pain are known as the classic triad of Henoch–Schönlein purpura (1).
• Bluish purple bruises (purpura)— most often on Joints .
• Swollen, achy joints.
  fever.
• Bleeding in the digestive tract may cause abdominal pain.
• Hematuria may develop.
• Bleeding in the kidneys may cause kidney damage.

The diagnosis is based on the symptoms.

Prognosis:- Most people recover completely within a month, but symptoms may recur several times.

Return to other triads here.

-References:-
(1) Kraft DM, Mckee D, Scott C (1998)"Henoch-Schönlein purpura: a review" Am Fam Physician 58 (2): 405–8, 411. PMID 9713395.