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Aims: Pityriasis lichenoides chronic is a rare inflammatory dermatosis, unusually hypochromic in dark phototypes. The evolution of the disease is usually benign, but a malignant transformation in mycosis fungoides is reported. You have to know how to think about it when faced with a generalized hypochromic macular eruption in children. Case Report: We report a case of a 13-years-old child, photo type 4.He presented for 8 months hypochromic macular lesions, located initially at the face. The evolution was marked by the extension at the trunk and the limbs. He was treated for pityriasis versicolor but without improvement. A skin biopsy was then performed, in favor of Pityriasis Lichenoides Chronica (PLC) with a lymphoid infiltrate made up mainly of CD4 T lymphocytes. The child was put on cyclin associated with heliotherapy with a moderate improvement after 3 months of treatment. The patient was followed for 2 years during which he did not present any malignant transformation. Discussion: Pityriasis Lichenoides is less frequent in the pediatric population.Its etiopathogenesis is still incompletely elucidated. The basic lesion is an erythematous-squamous papule in the trunk. Hypochromic macules can also be observed, either at the cicatricial stage of the disease, or they occur immediately, especially in subjects with dark skin. The histology of PLC reveals perivascular lymphocytic infiltrate in the superficial dermis..The adopted therapeutic is based on heliotherapy or an antibiotic from the macrolide or cyclin family. Evolution towards Mycosis Fungoides has been rarely described. Conclusion: PLC is exceptionally hypopigmented from the outset. We report a case of chronic leucomelanodermic pityriasis lichenoides in a child posing a problem of differential diagnosis.

Aim: Onychomycosis is a rare pathology in infants which constitutes 15.5% of onychodystrophies in children, especially those with Down syndrome and the immunocompromised. Dermosocpy is an innocuous examination allowing to guide the clinical diagnosis and to avoid invasive examinations. Presentation of Case: 5-month-old infant presents with thickening of the thumbnail of the left hand with xanthonychia evolving for 20 days without notion of trauma. On clinical examination, xantho-pachyonychia of the thumbnail of the left hand was noted reaching the latero-distal part with subungual hyperkeratosis and peronyxis. Dermoscopy showed yellowish chromonychia, longitudinal striae, subungual hyperkeratosis with jagged edges. The mycological direct examination and culture was in favor of a Candida albicans infection The patient was put on an antifungal cream with improvement after 3 months. Discussion: The rarity of onychomycosis in infants can be attributed to several factors such as the difference in the structure of the nail plate, less exposure to trauma and rapidity of nail regrowth. The average age is 8 months, the sex ratio at 0.98 and the preferential location is the fingernails. Clinically the nail involvement is of the disto-lateral type with subungual hyperkeratosis and peronyxis. Dermatoscopy is a quick tool showing chromonychia, longitudinal streaks, subungual hyperkeratosis producing a “ruined appearance”, distal onycholysis with jagged edges and linear hemorrhages. Infant onychomycosis is most often of candidal origin (C. albicans). Topical antifungals (ciclopirox) are preferred. Conclusion: This case is being reported to highlight the important role of dermoscopy in the diagnosis of onychomycosis and thus prevent unnecessary biopsies.