Lichen Planus, Lichen Planus

Lichen planus does not involve lichens; the name refers to the appearance of affected skin.

It is not contagious Penn State College of Medicine - Lichen Planus and does not involve any known pathogen. Some lichen planus-type rashes (known as lichenoid reactions) occur as allergic reactions to medications for high blood pressure, heart disease and arthritis.

Lichen planus may go into a dormant state after treatment. There are also reports that lichen planus can flare up years after it is considered cured.

Source: Wikipedia > Lichen Planus