The only indication of giving coicosteroids in pustular psoriasis is
**Core Concept**
Pustular psoriasis is a rare and severe form of psoriasis characterized by widespread pustules and erythema. Corticosteroids are typically avoided in pustular psoriasis due to their potential to trigger generalized pustular psoriasis or exacerbate the condition. However, there is one specific indication where corticosteroids are used.
**Why the Correct Answer is Right**
The correct indication for corticosteroids in pustular psoriasis is in the treatment of generalized pustular psoriasis (GPP) or acute generalized exanthematous pustulosis (AGEP) associated with drug eruption, particularly when caused by psoralen and ultraviolet A (PUVA) therapy. Corticosteroids can help to reduce inflammation and prevent complications. This is because the inflammation in GPP or AGEP is often more severe and widespread, making corticosteroids a necessary treatment to prevent systemic complications.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because systemic corticosteroids are generally contraindicated in pustular psoriasis, particularly in localized forms like palmoplantar pustulosis.
**Option B:** This option is incorrect because topical corticosteroids can actually trigger or exacerbate pustular psoriasis, particularly in localized forms.
**Option C:** This option is incorrect because biologics, such as etanercept, are often preferred over corticosteroids in the treatment of pustular psoriasis due to their targeted mechanism of action and lower risk of adverse effects.
**Clinical Pearl / High-Yield Fact**
Pustular psoriasis can be triggered or exacerbated by various factors, including systemic corticosteroids, beta-blockers, and certain medications like NSAIDs. It's essential to carefully evaluate the patient's medical history and medication list before initiating treatment.
**Correct Answer:** B.