Lichen Planus
Lichen planus is an inflammatory disorder that can involve the skin, mucous membranes, nails, and/or scalp. It can be very challenging to treat and in aggressive cases can lead to irreversible scarring of the nail. One of the most common presentations of nail lichen planus is ridging. These are longitudinal ridges, similar to onychorrhexis; however, there is usually associated nail plate thinning as well.
