© Angel Fernandez Flores, MD, PhD Lichen planus-like keratosis


Lichen planus-like keratosis


Aka benign lichenoid keratosis.



It is thought to represent an inflammatory regression reaction to a solar lentigo or to a seborrheic keratosis.


Clinical presentation

Solitary violaceous, smooth or slightly verrucous non-pruritic papule or indurated plaque, on the trunk and upper extremities.



Dermal lichenoid inflammatory infiltrate, mainly made of CD8+ cells.

Vacuolar alteration of the basal cell layer.

Necrotic keratinocytes are easilly found.

Hypergranulosis and hyperkeratosis.

Eosinophils and parakeratosis does not exclude the diagnosis.

Sometimes residual solar lentigo is seen in the periphery of the lesion.


© Angel Fernandez Flores, MD, PhD