**Core Concept**
Dermatomyositis is a type of inflammatory muscle disease characterized by skin and muscle inflammation, leading to elevated creatine kinase (CK) levels. Steroid therapy is a common initial treatment for dermatomyositis, aiming to reduce inflammation and improve symptoms.

**Why the Correct Answer is Right**
The patient has shown improvement in symptoms on steroids for 6 months, indicating a good response to the current treatment. However, the persistently elevated CK level of 1300 Units/L suggests ongoing muscle damage. The next step in management would be to assess the patient for potential steroid-related side effects, such as osteoporosis, hypertension, or glucose intolerance, and consider alternative treatments to maintain disease control while minimizing steroid use.

**Why Each Wrong Option is Incorrect**
**Option A:** Continuation of current steroid therapy alone may not be sufficient to control the disease, as evidenced by the persistently elevated CK level.
**Option B:** Initiating immunosuppressive therapy, such as methotrexate or azathioprine, may be considered to maintain disease control while reducing steroid use, but this is not the immediate next step.
**Option C:** Discontinuing steroid therapy without a clear plan for alternative treatment may lead to disease flare-up and worsening of symptoms.
**Option D:** This option is incomplete.

**Clinical Pearl / High-Yield Fact**
In patients with dermatomyositis, regular monitoring of CK levels, along with clinical assessment, helps identify those who may require alternative treatments to maintain disease control and minimize steroid-related side effects.

**Correct Answer: B. Initiating immunosuppressive therapy, such as methotrexate or azathioprine, may be considered to maintain disease control while reducing steroid use.**