This child developed a linear rash that extended all the way to the fingernail (see below).

LICHEN STRIATUS

Lichen striatus (LS) is a linear inflammatory condition that typically affects young children.

• It is thought that an acquired stimulus such as a virus or vaccination may induce loss of immunotolerance toward mosaic keratinocyte clones that undergo attack from, and clearance by, cytotoxic T cells.
• Known triggers to LS (or Blaschkitis) include trauma, vaccines, medications, and viral infections, including Covid and Covid vaccines.

Blaschkitis

The term "blaschkitis" was coined to describe an acquired linear inflammatory dermatosis following Blaschko's lines in an adult patient. The similarities to LS are many and it has been argued that Blaschkitis and LS represent the same entity.

Linear papules or red, scaly lesions which appear suddenly in a child and follow Blaschko's lines are characteristic. It may occur at any age and may affect nearly any body site, including the face. Post inflammatory hypopigmentation is common. Some patients who present late may just have linear hypopigmentation.

Lichen Striatus can cause dystrophy of the nail.

RegionalDerm

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