Co-existence of Juvenile dermatomyositis and psoriasis vulgaris with fungal infection: A case report and literature review.

INTRODUCTION: The incidence rate of psoriasis vulgaris (PSV) coexisting with Juvenile dermatomyositis (JDM) is low. Through our thorough literature search, we found that PSV arising on JDM with superficial fungal infection of facial skin is rarely reported. So, we hereby, report a case of combination of the above three diseases. Meanwhile, we also reviewed the previous literatures aiming at the related basis, clinical manifestation, diagnosis, and treatment of the diseases. Interestingly, of all cases, this case is the only one in which the symptom of muscle weakness preceded the appearance of rash.

CASE PRESENTATION: A 21-year-old man diagnosed with JDM 6 years ago came to our inpatient department due to the appearance of new rash. Skin examination showed some sharply demarcated scaly plaques over the head, neck, torso, and bilateral upper limbs with pruritus and scaling. Histological examination and typical clinical manifestation confirmed the diagnosis of PSV for his new rash. Family history was negative for JDM and PSV. The clear erythema located on his face revealed the existence of superficial fungal infection with the help of fungal fluorescence microscopy. He had marked improvement of his symptoms with the treatment given at our department. In the past 3 months, the patient has been on regular follow-up at our outpatient department, and his condition is stable at present.

DISCUSSION: This paper presents a case of PSV arising on JDM coexisting with superficial fungal infection on the face hoping that this will help clinicians in the better diagnosis of the diseases during literature search.