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By Mayo Clinic staffDoctors don't know what causes lichen nitidus. However, it may be occasionally seen with the following other conditions:
- Lichen planus. This inflammatory skin condition causes an itchy rash on your arms, legs and trunk and soreness in your mouth.
- Amenorrhea. The absence of a monthly menstrual period is called amenorrhea.
- Crohn's disease. Crohn's disease causes an ongoing inflammation of your intestinal tract.
- Juvenile rheumatoid arthritis. This painful, chronic swelling of the joints affects children.