Linear and whorled nevoid hypermelanosis (LWNH) is a rare skin condition characterized by the presence of brown or grayish-brown patches on the skin. These patches typically follow a linear or whorled pattern, hence the name. LWNH is usually present at birth or appears in early childhood and tends to persist throughout life.
LWNH is a benign condition and does not cause any significant health problems. The exact cause of LWNH is unknown, but it is thought to be a result of abnormal melanocyte development during embryogenesis. The patches of hyperpigmentation are typically flat and do not cause any symptoms such as itching or pain.
Diagnosis of LWNH is based on the characteristic appearance of the skin lesions. No specific treatment is required for LWNH as it is a cosmetic concern rather than a medical issue. However, individuals with LWNH may choose to undergo cosmetic procedures such as laser therapy or topical creams to lighten the patches if desired.
It is important to note that LWNH is a distinct condition from other pigmentation disorders and should be diagnosed by a qualified dermatologist to rule out other potential causes.