Miliaria rubra (also known as prickly heat[1] and heat rash[1]) is a skin condition that appears as discrete, extremely pruritic, erythematous papulovesicles accompanied by a sensation of prickling, burning, or tingling.[2]:23 Differential diagnosis should be used to rule out polycythemia vera, which is a rare hematological disorder and appears more often in males than females, and generally not before the age of 40. Both disorders share the common denominator of appearing after taking a hot shower.[citation needed]
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