Guttate psoriasis is a form of psoriasis that presents as multiple, discrete papules that begin on the trunk and mimic a viral exanthem. The word guttate means "tear drop" or "raindrop" shaped. This form of psoriasis is more common in children than adults and is primarily seen on the trunk and extremities. Guttate psoriasis is oftentimes associated with streptococcal pharyngitis and may follow a sore throat after two to three weeks. Children with guttate psoriasis should be evaluated for foci of streptococcus either in the throat or rectum. Children with an episode of guttate psoriasis are likely to develop psoriasis vulgaris within five years.

Differential diagnosis

Guttate psoriasis can be confused with pityriasis rosea, but lacks the herald patch and has much thicker scale. Guttate psoriasis also can look like a viral exanthem, urticaria, drug eruption, or secondary syphilis.

Treatment

Any evidence of streptococcal disease should be treated with an appropriate antibiotic.