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Pedal dermatophyte infection in psoriasis.

N Hamnerius¹, J Berglund, J Faergemann

¹Department of Dermatology, Blekinge Hospital, S-371 85 Karlskrona, Sweden. nils.hamnerius@ltblekinge.se

The British Journal of Dermatology

|June 25, 2004

Summary

This study found no significant difference in the prevalence of fungal skin infections, including tinea pedis and tinea unguium, between patients with psoriasis and the general population. These findings do not support the idea that psoriasis increases the risk of these common fungal infections.

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Area of Science:

Dermatology
Mycology
Epidemiology

Background:

Dermatophyte infections, such as tinea pedis and tinea unguium, are typically considered uncommon in individuals with psoriasis.
However, some evidence suggests a potentially higher prevalence of tinea unguium in psoriatic patients compared to healthy individuals.
Tinea unguium often develops secondary to tinea pedis infections.

Purpose of the Study:

To investigate and compare the prevalence of tinea pedis and tinea unguium in patients diagnosed with psoriasis versus a control group without psoriasis.
To determine if there is a statistically significant difference in the occurrence of these fungal infections between the two groups.

Main Methods:

A comparative study involving consecutive adult outpatients (18-64 years) with psoriasis and a control group without psoriasis or atopic dermatitis.

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Clinical examinations and mycological analysis (direct microscopy and culture) of samples from interdigital spaces, soles, and toenails were performed.

The control group consisted of patients seeking mole examinations, ensuring they did not have psoriasis or atopic dermatitis.

Main Results:

The study included 239 patients with psoriasis and 245 control patients.
The prevalence of tinea pedis was 8.8% in the psoriasis group and 7.8% in the control group.
The prevalence of tinea unguium was 4.6% in the psoriasis group and 2.4% in the control group, with no statistically significant differences observed between the groups for either condition.

Conclusions:

The findings do not support the hypothesis that patients with psoriasis have a different prevalence of tinea pedis or tinea unguium compared to the general population.
This study suggests that psoriasis itself may not be a significant risk factor for developing these specific dermatophyte infections.