Lichen planus (1411)

What is lichen planus (LP)? 

• Lichen planus is a skin condition of purple or reddish-purple, flat bumps. 
• There may be white scales or flakes on the bumps. 
• It can happen on any part of the body, but is most often found on the inner wrists, forearms, ankles, genital area or in the mouth. It can also affect the nails and scalp. If it is on the scalp, it may cause hair loss. 
• Most often, the areas are itchy. Most often, they are not painful unless an area has turned into an open sore. This happens from scratching.
• Most often, it lasts 1 to 2 years. Sometimes it will last longer. It may come and go. As it heals, a dark brown area may be left on the skin. The brown area will go away on its own, but may take several months to years.

What causes it? 

There is no specific cause of LP. It may be related to the immune system or an allergic reaction. Sometimes, it may be set off by certain medicines. It is important to report any medicines being taken. 

How is it diagnosed? 

A doctor, called a dermatologist, looks at the skin. Sometimes a biopsy may need to be done. A biopsy is when a small sample of the tissue is taken and looked at under a microscope. 

How is it treated? 

• Lichen planus is not curable. It may go away on its own within 1 to 2 years. 
• Steroids may be used on the skin (topical) for itching. Oral antihistamines may be prescribed for the itching. Rarely, other types of oral medicines are used.
• Light therapy may be prescribed in severe cases. 
• Sunscreen should be used when your child is outside.
• All products used on the skin should be free of fragrance.