Lichen sclerosus
Prevalence of the scarring disorder lichen sclerosus ranges from 1.7% to 3% in the research literature and pathogenesis is likely multifactorial.
“It’s a very frustrating condition for patients and for physicians because we don’t know exactly what causes it, but it definitely has a predilection for the vulva area, and it affects women of all ages,” she said. “I also think it’s more common than we think.”
Loss of normal anatomical structures are a key feature, so physicians need to know their anatomy well to look for what’s not there. Lichen sclerosus involves modified mucous membranes and the perianal area, and it may spread to the crural folds and upper thighs. Symptoms can include periclitoral edema, white patches, pale skin, textural changes (such as wrinkling, waxiness, or hyperkeratosis), fissures, melanosis, and sometimes ulcerations or erosions from scratching.
There is no standardized treatment for lichen sclerosus. Research suggests using a high potency topical steroid treatment daily until skin texture normalizes, which can take anywhere from 6 weeks to 5 months, depending on severity, Dr. Kornik said. Few data are available for management if topical steroids do not work, she added.*
If dealing with recalcitrant disease, she recommends first checking the patients’ compliance and then considering alternative diagnoses or secondary conditions. Do patch testing, rule out contact dermatitis, and rebiopsy if needed. Other options are to add tacrolimus ointment, offer intralesional triamcinolone, consider a systemic agent (acitretin, methotrexate, or possibly hydroxychloroquine), or try laser or photodynamic therapy. She emphasizes the importance of demonstrating to the patient where to apply ointment, since they may not be applying to the right areas.*
Lichen simplex chronicus
Lichen simplex chronicus is a clinical description of the result of chronic rubbing and scratching. It might be triggered by something that has now resolved or be linked to other itching conditions, but clinicians need to consider the possibility of neuropathic itch as well.
Features of lichen simplex chronicus can include bilateral or unilateral involvement of the labia majora, erythematous plaques with lichenification, hyper- or hypopigmentation, or angulated excoriations and hypertrophy of labia caused by thickened skin, though the signs may be subtle, she said.
Treatment requires management of the skin problem itself – the underlying cause of the itch – as well as the behavioral component. Topical steroids are first line, plus an antihistamine at night as needed to stop the scratching. If those are insufficient, the next treatments to consider are intralesional triamcinolone (Kenalog), tacrolimus ointment, topical or oral doxepin, mirtazapine, or even selective serotonin reuptake inhibitors.
Women using topical steroids should also be aware of the possible side effects, including atrophy, infections, and allergic contact dermatitis if the steroid itself or the cream it’s in is an allergen. If stinging or burning occurs, switch to a steroid without propylene glycol, she added.
If no changes occur in the skin, clinicians may have to consider the existence of neuropathic pruritus diagnosis, an injury or dysfunction along the afferent itch pathway. Burning is more common with this neuropathy, but itching can occur too.
Other issues include symptoms that worsen with sitting and pain that worsens throughout the day. Causes can include childbirth, surgery, pelvic trauma, infection, and chemoradiation, and diagnosis requires imaging to rule out other possible causes. Treatment involves pelvic floor physical therapy, pudendal nerve block, or gabapentin.
Dr. Kornik wrapped up with a reminder that vulvar itch is often multifactorial, so clinicians need to chip away at the potential causes – sometimes with cultures, scrapes, and biopsies as needed.
She reported no financial disclosures.
Correction, 10/26/18: Dr. Kornik's treatment recommendations for lichen sclerosus were misstated.