Small follicles may be the result of normal ovulation or pathologic follicular dysplasia. 1. Normal ovulation: generally the follicle develops to 18-20mm, and this kind of situation may occur before ovulation, which indicates that the follicle is about to ovulate, and it is usually a normal situation. Pre-ovulatory follicles are the final stage of follicular development, with increased follicular fluid, enlarged follicular chambers, smaller follicular membranes, and follicles protruding toward the surface of the ovary. At this time, you can arrange for coitus, thus increasing the probability of fertilization. 2. Pathological follicular dysplasia: for example, long-term use of contraceptive pills, endocrine hormone disorders, etc. can also lead to the growth of follicles and lining asynchronous. The larger the follicle, the less likely it is to be discharged, resulting in a smaller lining. Aspirin and other drugs can be used to help the lining grow. Consult your physician for specifics, and use medication as prescribed by your doctor.