retronychia

Etiology

• repeated trauma or pressure

Pathology

• ingrowth of the nail plate into the proximal nail fold
• repetitive injury to the nail matrix may disrupt nail growth & alignment, with formation of new nail plates beneath the original plate,

Clinical manifestations

• characteristic appearance of multilayered nail plate stacking
• in acute retronychia, proximal nail fold inflammation is typically present,
• in chronic retronychia, inflammation is often mild or absent

* images

Differential diagnosis

• onychomadesis

More general terms

• skin appendage disease