Congenital curvilinear palpable hyperpigmentation

Heel-line hyperpigmentation: a variant of sock-line hyperpigmentation after the use of heel-length socks

Two infants developed hyperpigmented curvilinear patches on the posterior heel after wearing heel-length socks. Both of the patient's lesions improved after discontinuing the use of the heel-length socks. Hyperpigmented patches called sock-line or mitten-line hyperpigmentation have been reported at sites of tight elastic bands from socks or mittens in infants on the calves and wrists. Recognizing this clinical entity is important to differentiate it from other causes of linear lesions such as child abuse or amniotic band syndrome.

Mitten-line hyperpigmentation: a reactive process analogous to sock-line hyperpigmentation

A 3-month-old girl presented with a 6-week history of a curvilinear hyperpigmented patch on the left wrist, which began within a day of using a tight mitten. Mitten-line hyperpigmentation is analogous to the recently described condition known as infantile "sock-line hyperpigmentation," or more generally "sock-line bands." Distinguishing this benign condition from child abuse, amniotic band syndrome, and acquired raised bands of infancy is important but sometimes challenging.

Update on syndromes with cutaneous manifestations and new diagnoses in dermatology

Systemic syndromes with cutaneous manifestations represent a continually evolving entity. New syndromes are described, while improved understanding of others, with new features of disease or enhanced genetic understanding of the disease are discovered. This review highlights the latest information on syndromes with cutaneous manifestations and presents several newly described dermatologic diagnoses.