Are skin allergies related to menstruation?

　　skin allergies Is it related to menstruation? ? Every spring, many girls go out wearing masks. There are also some "beauties" who have very high requirements for cosmetics and cannot use animal-derived beauty products. Some can only use one or two products. If a new product comes out, they can only try it on inconspicuous areas such as behind the ears. Otherwise, their faces will be filled with red envelopes and look ugly. These girls will all say that they are "allergic". How are allergies caused? None of them could explain it clearly, except that it happened to girls all the time. In fact, there is no conclusive conclusion in medicine, and the latest medical survey found that the probability of allergies is closely related to the mother's menstrual period.

　　The survey, conducted by Imperial College London, followed 5,188 women born in Finland between 1966 and 1997. When they were 31 years old, a skin allergy test was done to detect whether they had allergies. Medical information collected included the time they developed allergies and their mother's age at menarche. Among those who participated in the survey whose mothers had menarche at or before the age of 12, 35% had a positive allergy test. In comparison, mothers whose menstrual periods occurred at 13 years old had a 32.5% chance of their daughters suffering from allergies, and mothers who had their menstrual periods at 15 years old had a 32.5% chance of their daughters suffering from allergies. The probability of allergies is 30%. The daughter of a mother whose menstruation started after the age of 16 has a 26.4% chance of suffering from allergies. This study shows that the daughter of a woman who has her menstruation before the age of 12 is 1.5 times more likely to suffer from allergies than the daughter of a woman who has her menstrual period later.

　　What's the link between a mother's age at menarche and her daughter's allergies? ? Researchers speculate that it is the role of hormones, at least female Hormones play an important role in this. However, this study only shows preliminary correlations between them and is not yet conclusive. The researchers say they need to conduct further research to determine whether there is a biological link between the two phenomena.