Less and less pubic hair may be a normal physiological phenomenon, or it may be caused by endocrine disorders, vulvar inflammation, local skin diseases and other reasons. 1. Normal physiological phenomenon: the situation of less and less pubic hair may be related to women’s age, generally after the age of the pubic hair will gradually decrease, if the women are tired for a long time, stay up all night, resistance to decline, excessive pressure, etc. may also appear to reduce the pubic hair situation. 2. Endocrine disorders: when the patient’s endocrine disorders lead to a certain degree of decline in androgen, there may also be less and less pubic hair. 3. External Inflammation: When there are bacterial or viral infections on the vulva, it may cause vulvar inflammation, which may lead to less and less pubic hair. 4. Local skin diseases: when patients have seborrheic dermatitis, folliculitis and other skin diseases, due to the local sebaceous glands, sweat glands secretion, metabolic abnormalities, which may lead to a gradual decrease in the number of local pubic hair. Less and less pubic hair is recommended that patients seek timely medical examination to rule out abnormalities, clear causes of targeted treatment when necessary, usually pay attention to health in life, maintain local skin hygiene and dryness, usually to ensure that sleep, reduce late at night, pay attention to rest and so on.