Final answer:
Lichen planus is characterized by hypopigmented skin, skin lesions, and nodules, and may include systemic effects like nausea and confusion. It can also result in the loss of peripheral nerve function and extreme cases might lead to a loss of extremities.
Step-by-step explanation:
The clinical features of lichen planus include several distinct physical manifestations. Patients with lichen planus may present with hypopigmented skin, which refers to patches of skin that are lighter than the surrounding area. Another common symptom involves skin lesions and nodules, which are solid and often itchy bumps on the skin. Additionally, lichen planus can lead to the loss of peripheral nerve function, potentially resulting in numbness or tingling. In some cases, the condition may be severe enough to lead to the loss of fingers, toes, or other extremities. Lichen planus may also affect the mucous membranes, which can lead to a large brown spot on the skin sprinkled with darker specks, or a small lesion with an irregular border and parts that appear red, white, blue, or blue-black. Rarely, lichen planus can have systemic effects such as nausea, vomiting, photophobia, stiff neck, and confusion.