Cutaneous tuberculosis (TB) known as tuberculid forms 1%–1.5% of all extrapulmonary manifestation of TB. Tuberculids result from a hypersensitivity reaction to an extracutaneous source of Mycobacterium tuberculosis in individuals with high immunity and can be difficult to diagnose. Lichen scrofulosorum (LS) is a rare form of tuberculid predominantly seen in children and young adults; we report a case of an 8-year-old boy evaluated for fever and mediastinal lymphadenopathy in whom the skin lesions, LS, served as an important clue for the diagnosis of tuberculous lymphadenitis.

Psoriasis is a chronic, immune mediated, systemic inflammatory skin disease with a reported prevalence of 0.6%–4.8% in the general population. Bipolar disorder (BP) is a severe episodic psychiatric disorder that ranks as the fourth leading cause of disability. Recent evidence suggests that genetic and immunological factors play a significant role in the development of both disorders. Studies have also shown a higher association of psychiatric disorders among patients with psoriasis. Moreover, several autoimmune comorbidities have been reported in association with BP. Here, we describe a young woman with BP who developed psoriasis after 1 year of developing BP and showed exacerbations in psoriasis lesions with each manic episode. We also highlight the safe and efficacious use of apremilast for psoriatic lesions in the woman.

In 1937, Siemens described a Dutch family with superficial blistering, flexural hyperkeratosis, and characteristic mauserung appearance. Since then, less than 20 kindreds with this condition have been described in the English dermatologic literature. A 14-year-old boy presented with history of recurrent blistering and peeling of skin since the age of 1 month, predominantly seen over limbs and trunk, often associated with secondary infection. His mother also had similar symptoms from childhood. On examination, the child had typical mauserung peeling of the skin and dirty gray hyperkeratosis in a rippled pattern over flexures. Skin biopsy from the boy showed intracorneal blistering with epidermolytic hyperkeratosis in the upper spinous layers. The typical history and clinical features along with characteristic histological findings confirmed our diagnosis of ichthyosis bullosa of Siemens. It must be differentiated from other conditions with epidermolytic hyperkeratosis and skin peeling, such as bullous ichthyosiform erythroderma of Brocq and peeling skin syndrome. Our patient responded well to 0.05% topical tazarotene gel over four weeks.