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Tinea Corporis in a 37-Year-Old Man
This itchy, scaly rash extending from the underarm onto the upper arm was tinea corporis.
A 37-year-old man noted the recent appearance of a very itchy and scaly rash extending from the underarm onto the upper arm. He was in good health, had no pets, and had no exotic travel history.
Key point: The annular nature of this eruption suggests a number of potential diagnoses. However, the intense pruritus most strongly suggests tinea or granuloma annulare. Most of the other causes of annular skin lesions are asymptomatic. A KOH preparation disclosed innumerable fungal hyphae, establishing the diagnosis of tinea corporis.
Treatment: Because of the circumscribed nature of the tinea, the patient was instructed to apply naftifine 2% cream to the affected area once daily. The lesions cleared in 2 weeks.
Note: While he did not own a pet himself, he often visited a friend who owned a new puppy. It is presumed that this was the environment from which the dermatophyte originated.
FDA Approves Guselkumab for Pediatric Plaque Psoriasis and Active Psoriatic Arthritis
September 30th 2025The FDA has approved guselkumab for children aged 6 years and older with moderate to severe plaque psoriasis or active psoriatic arthritis, making it the first IL-23 inhibitor authorized for pediatric use.
