Annular pustular psoriasis (APP) is a rare form of pustular psoriasis with a chronic recurrent course and good prognosis. We report three cases of APP in children, two of whom were siblings. Review of the medical literature reveals that a disproportionately high percentage of cases of APP occur in children. In some cases topical therapy can clear the condition, although in severe or recalcitrant disease, systemic therapy may be necessary.

Palmoplantar eccrine hidradenitis is a self-limited disease characterized by painful erythematous papules and nodules of abrupt onset on the soles, and less frequently on the palms, of young individuals in good health. We describe seven children, four girls and three boys, between 4 and 12 years of age, with characteristic cutaneous and histopathologic findings of palmoplantar eccrine hidradenitis. All patients had complete resolution of their lesions within 2-4 weeks without treatment, however, one child experienced recurrences. All skin biopsy specimens showed a deep dermal mixed infiltrate with abundant neutrophils surrounding eccrine sweat glands, the histologic hallmark of the disease. Palmoplantar eccrine hidradenitis is a distinct clinical entity in which physical activity, excessive sweating, and prolonged wetness are possible triggering factors. The regression of the lesions is usually rapid, with complete clearance after 1 month, although there may be recurrent episodes.

Malakoplakia is a rare, chronic disease with pleomorphic presentation. It occurs most frequently in immunocompromised patients. It is believed that this entity represents an unusual response to bacterial infection in which macrophages fail to phagocytose them properly. It involves many organs, particularly the urinary and gastrointestinal tracts. It is uncommon on the skin and less common in children. The diagnosis is usually based on histopathologic findings.