Lichen striatus is a harmless, noncontagious rash that primarily affects children. It appears as smooth or scaly flat-topped bumps that can be pink, tan, or flesh-colored. These bumps usually form a line or band on the skin, often on the arms and legs. The rash is uncommon and most frequently occurs in children between the ages of 5 and 15, affecting more girls than boys. The exact cause of lichen striatus is unknown, but it may be linked to genetic factors, environmental triggers, allergies, or inflammatory responses. It sometimes appears after viral infections, vaccinations, or injuries. The rash typically goes away on its own within a year, although it can last from a month to three years. It does not leave permanent marks, but temporary skin discoloration may occur. If the rash is itchy or bothersome, moisturizers or steroid creams can be applied. In more severe cases, tacrolimus or pimecrolimus cream may be used. It's important to consult a doctor to confirm the diagnosis and rule out other conditions.