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Psoriasis is one of the most prevalent systemic inflammatory diseases, affecting approximately 2% to 3% of the population and more than 125 million patients worldwide. Previous studies provide evidence that there is a greater frequency of autoimmune diseases among patients with psoriasis than in the general population, and many inflammatory autoimmune diseases are a result of derangements in multiple cytokine pathways [1].

The association between psoriasis and alopecia areata was still in conflict, until Szu-Ying Chu and et al. [2], conducted research in Taiwan demonstrating that patients with alopecia areata had a higher risk of developing psoriasis compared to general population. Psoriasis is classified in a category of diseases related to Th1 pathway cytokines, including interferon-g, IL-12 interleukin, and IL-2, which are also important in the pathogenesis of alopecia areata. Therefore, a correlation between these two diseases was conceivable [3]. We report the case of 14-year-old child, without significant pathological ATCD. Who had an occipital alopecian patch since the age of 10, which progressively worsened by the extension of the lesion and a depilation of the eyebrows, 2 years later, the appearance of several erythematous lesions sitting at the level of the 4 limbs and then extending over the rest of the body evolving in a context of conservation of the general state. Dermatological examination revealed the presence of multiple diffuse squamous erythematous patches in the whole body (Figure 1) as well as in the vertex, infiltrated with positif methodic scratching of Brocq, a diffuse alopecic scar patch of the scalp (Figure 2).

The examination also revealed a depilation of eyebrows and eyelashes. Dermoscopy of the scalp showed cicatricial alopecia in places, yellow dots, black dots, cadaverous hair (Figure 3) and for patches, it showed a diffuse dotted vascularization corresponding to psoriasis vulagris (Figure 4).