Recalcitrant lichen planus pigmentosus treated with topical ruxolitinib.

Competing Interests: Dr Kwatra is an advisory board member/consultant for Abbvie, Aslan Pharmaceuticals, Arcutis Biotherapeutics, Castle Biosciences, Celldex Therapeutics, Galderma, Genzada Pharmaceuticals, Incyte Corporation, Johnson & Johnson, Leo Pharma, Novartis Pharmaceuticals Corporation, Pfizer, Regeneron Pharmaceuticals, and Sanofi and has served as an investigator for Galderma, Incyte, Pfizer, and Sanofi. All others declare no conflict of interest to declare. Dr Patel is an advisory board member/consultant for Arcutis Biotherapeutics, Dermavant, Incyte, Sanofi, and Regeneron.