Hello,
For the skin and hair issues and the periods problems that you are having, two important possibilities which need to be ruled out are thyroid disease and PCOS (polycystic ovarian disease). Both
can cause pimples, acne, dry skin and brittle hair. Hence get your thyroid profile done. For PCOS, you can get tests like 2 hr GTT, serum androgen and testosterone levels, LH-FSH ratio, prolactin levels, TSH levels,17-hydroxyprogesterone levels and 3D ultrasound uterus done.