Taking vitamin A alone is not effective in treating ichthyosis. Taking vitamin A can only play a supplementary role in ichthyosis. It is recommended that ichthyosis be treated reasonably and regularly under the guidance of a doctor. The main cause of ichthyosis is due to heredity, and the main clinical manifestations are flaky skin and ichthyosis. In daily life, you can improve the skin condition by bathing, using moisturizer and so on. Topical medications (e.g., urea cream, vitamin A acid, etc.) are needed under the direction of a doctor to treat the disease. In severe cases, oral medication is needed for treatment, especially in winter when the condition is severe. At present, there is no specific medicine for ichthyosis. Treatment can improve the symptoms, but cannot cure it. If you are self-conscious about the aesthetic effects, you can visit a hospital and consult a dermatologist.