Which of the following is NOT erythrodermic psoriasis? (assume all these rashes cover >90% of the body)
Well done, correct.
Erythrodermic psoriasis usually occurs in the setting of known worsening or unstable psoriasis and is characterised by erythroderma (generalised reddening of the skin) covering ≥90% of the body surface area (BSA). on top of the typical features of psoriasis. Remember, psoriasis itself is characterised by clearly defined, red, scaly patches of skin. Other features may include nail pitting and onycholysis.
Sézary syndrome a.k.a "red man syndrome" is a rare type of cutaneous T cell lymphoma (CTCL) characterised by the triad of erythroderma (>80% of body surface area), lymphadenopathy, and atypical malignant Sézary cells in the skin, blood, and lymph nodes.
