Both of them appear as small, skin-colored bumps that look like chicken skin, the size of a pinpoint to a small grain of rice, with a hard texture and a pointed tip that feels like a sting when touched. The main difference between the two is that lichen planus is flaky, with many of the same bumps growing densely on a small patch of skin, with the elbow and knee joints and the trunk being the common sites. The baby’s cheeks or the extensor surfaces of the limbs. The cause of lichen planus is unclear, but it is usually an aesthetic problem that does not affect the baby’s health. Some scholars believe that it is related to the lack of vitamins in babies, so you can give your baby appropriate pediatric multivitamin supplements, such as Xiao Shi Er Kang drops, 0.5 to 1 ml per day for 3 months to 6 months. Give your baby more vitamin A-rich foods, such as carrots or animal liver. Topical vitamin A ointment can be applied topically to the skin and touched once a day at night for 3 months to 6 months. There are three points to note during the medication: (1) vitamin A ointment has different concentrations, such as 0.025%, 0.05% and 0.1%, pay attention to must be used from the low concentration, first with 0.0% vitamin A ointment, after the baby’s skin adapt to, gradually transition to 0.1% concentration. (2) the side effect of vitamin A ointment is the use of local dry skin, sometimes red or even peeling, so every day during the day with local touch some moisturizer to the baby to reduce side effects. (3) Individual babies may be localized redness and swelling after using the medicine, which indicates that the baby is allergic to the ointment of vitamin A acid, to stop using it in time.