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

 

Lichen planus-like keratosis

 

Aka benign lichenoid keratosis.

 

Comments

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.

 

Morphology

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