Long spots may be caused by freckles, chloasma, post-inflammatory hyperpigmentation and other diseases. To get rid of spots, we need to use skin discoloring agents, Vitamin A acids and oxidant ointments, such as hydroquinone cream and Vitamin A acid ointment, for the cause of the disease. 1. Freckles: If patients want to get rid of freckles, they can use topical skin discoloring agent, such as hydroquinone cream, etc., or Vitamin A acid drugs, such as Vitamin A acid ointment. 2. Melasma: patients can use topical retinoic acid drugs, such as retinoic acid ointment, adapalene gel, etc., or skin discoloring agents, such as hydroquinone cream. 3. Post-inflammatory hyperpigmentation: patients can apply topical retinoic acid drugs, such as retinoic acid ointment. Pigmentation is recommended to seek medical advice, patients need to use drugs under the guidance of a doctor, do not use drugs without authorization.