Lichen Planus Like Keratosis.

LPLK describes inflammation in a benign skin lesion.

What is LPLK?

LPLKs are not that important except they do make the forest thicker when trying to find the wood.

LPLK is short for Lichen Planus like Keratosis, also called Lichenoid Keratosis.

LPLK is an inflammatory reaction and often occurs in a pre-existing skin lesion that is something else. This type of “Lichenoid Reaction” is common in a Seborrhoeic Keratosis or solar lentigo.

LPLK is common in sun-exposed areas and very common in Australia as a result of UV exposure. They therefore tend to occur in sun exposed areas such as the forearm, lower leg & face.

What does LPLK like?

LPLK is essentially a “changed” Seb K or solar lentigo. So you first need to know what a Seb K or Solar Lentio looks like. LPLK is usually flat, pink or red to start with (the inflammatory phase) and then becomes grey or greyish-brown.

LPLK tends to be identified at a skin check for one of two reasons

  • Acute Lichenoid reaction: A lesion has changed (a Seborrhoeic keratosis or age spot has developed a lichenoid reaction)
  • Longstanding LPLK: this “burnt out” lichenoid reaction is common as a <1cm patch of pale grey colour skin that is seen at a routine skin check. The diagnosis is normally confirmed with dermatoscopy.