**Core Concept**
Henoch-Schönlein purpura (HSP) is a form of vasculitis that affects small blood vessels, leading to the deposition of IgA immune complexes and subsequent inflammatory response. This condition often presents with a classic tetrad of symptoms: non-thrombocytopenic purpura, abdominal pain, arthralgias, and renal involvement.

**Why the Correct Answer is Right**
The correct answer is e) Purpura fulminans. Purpura fulminans is a severe and life-threatening complication of HSP, characterized by widespread thrombosis and necrosis of skin and organs. It is a medical emergency that requires prompt treatment, usually with anticoagulants and corticosteroids. In contrast, the other options are generally true statements about HSP.

**Why Each Wrong Option is Incorrect**
* **Option A:** Hematuria in HSP typically resolves with treatment, which may include corticosteroids and other immunosuppressive agents. This statement is generally true.
* **Option B:** Steroids are indeed effective in treating skin lesions and other symptoms of HSP. This statement is true.
* **Option C:** Arthralgias in HSP are often self-limiting and may resolve spontaneously. This statement is true.
* **Option D:** While HSP has a generally good prognosis, complications such as renal involvement or purpura fulminans can occur. This statement is somewhat true, but incomplete.

**Clinical Pearl / High-Yield Fact**
Purpura fulminans is a medical emergency that requires prompt recognition and treatment to prevent severe morbidity and mortality.

**Correct Answer:** e) Purpura fulminans