Usefulness of dermoscopy in the diagnosis and monitoring treatment of demodicidosis.

Demodicidosis is a common infestation and should be considered in the differential diagnosis of recurrent or recalcitrant perioral dermatitis or rosacea-like eruptions of the face. We report on a 34-year-old male, who presented with facial erythema and desquamation accompanied by a pruritic sensation. Dermoscopic examination revealed Demodex tails and Demodex follicular openings, both specific features of this entity. Microscopically, standardized skin surface biopsy test was pathogenic and the patient had positive response to anti-demodectic drugs. To our knowledge, a few reports of the dermatoscopic features of demodicidosis have been published in the literature. Dermoscopy offers a potential new option for a real-time validation of Demodex infestation and a useful tool for monitoring treatment.