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Lichen (Noun)

Any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc..

Nouns denoting plants.

The rocks were covered in a variety of colorful lichens that added to the beauty of the landscape.
Lichen grew thickly on the ancient tree trunks, a testament to the age and enduring power of the forest.
The dry, cracked soil supported a surprising amount of life, including hardy lichens that clung to its surface.
Crevices and cracks in the stone were filled with a lichen that had grown there undisturbed for centuries.
The old, weathered fence posts were covered in a patchwork of moss and lichen, slowly being consumed by the encroaching vegetation.

Any of several eruptive skin diseases characterized by hard thick lesions grouped together and resembling lichens growing on rocks.

Nouns denoting natural processes.

The patient was diagnosed with lichen planus, a chronic skin condition that caused intense itching and discomfort.
Lichen simplex chronicus is a type of skin disorder that results in thick, scaly patches on the skin.
The doctor prescribed a topical cream to treat the lichen scrofulosorum, a rare skin condition that was causing the patient's skin to become inflamed.
After years of suffering from lichen nitidus, the patient finally found relief with a new treatment that reduced the appearance of the small, shiny bumps on her skin.
The dermatologist warned that lichen striatus was a contagious condition that could be spread through skin-to-skin contact.