Which physical findings suggest tinea cruris (jock itch)?

Updated: Feb 22, 2018
  • Author: Michael Wiederkehr, MD; Chief Editor: Dirk M Elston, MD  more...
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Large patches of erythema with central clearing are centered on the inguinal creases and extend distally down the medial aspects of the thighs and proximally to the lower abdomen and pubic area.

Scale is demarcated sharply at the periphery.

In acute tinea cruris infections, the rash may be moist and exudative.

Chronic infections typically are dry with a papular annular or arciform border and barely perceptible scale at the margin.

Central areas typically are hyperpigmented and contain a scattering of erythematous papules and a little scale.

The penis and scrotum typically are spared in tinea cruris; however, the infection may extend to the perineum and buttocks.

Secondary changes of excoriation, lichenification, and impetiginization may be present as a result of pruritus.

Chronic infections modified by the application of topical corticosteroids are more erythematous, less scaly, and may have follicular pustules.

Approximately one half of patients with tinea cruris have coexisting tinea pedis.

Erythematous-scale plaques and erythematous-liquenificated plaques were the most frequently found clinical types in an excellent Brazilian study. [6] T rubrum was the prevalent dermatophyte in 90% of the cases, followed by T tonsurans (6%) and T mentagrophytes (4%).

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