Dull and yellowish skin may be related to lack of sleep, long-term sun exposure, skin dehydration, skin diseases, etc. Improvement methods include life conditioning, the use of skin care products, medication, photoelectricity treatment. 1. Lack of sleep: If the patient does not have enough sleep, it will lead to a slowdown in skin metabolism and a decrease in skin translucency. Need to ensure adequate sleep, can drink some hot milk before going to bed, listen to soft music and so on. If serious insomnia, can also take oral eszopiclone, diazepam and other drugs with the treatment. 2. Long-term sun exposure: ultraviolet radiation on the skin stimulation is relatively large, if the long-term sun exposure, will lead to skin spotting, look dull skin. Need to reduce the stimulation and damage of ultraviolet rays, you can use some skin care products with whitening effect. 3. Skin dehydration: If the skin is dehydrated for a long time, the skin will become dry and dull. You need to replenish water in time, you can drink more water, eat more food rich in vitamin C, and do a good job of skin hydration. 4. Skin diseases: If the patient has acne or allergic dermatitis, the skin will leave hyperpigmentation in the area after the skin recovers, you can follow the doctor’s instructions to apply hydroquinone cream to alleviate. In serious cases, it can be treated by picosecond laser, fruit acid peeling, photorejuvenation and other methods. The use of the above drugs should follow the doctor’s instructions. It is recommended that patients with yellowish and dull skin actively consult a doctor and strictly follow the doctor’s instructions, do not use medication privately.