The skin of my labia/vestibule area has been peeling and coming off when i wipe. the skin underneath seems normal, but my perineum is cracked and sore?

Need to examine: It is not feasible to know what the issue may be, without examining the skin. If you live in a cold climate, it may be the dry air causing dry skin. Try putting some emollient, like Vaseline, on the affected parts at night and omit the underwear. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex. Get HPV vaccine.

Needs to be seen: Lumps, bumps, blisters and other skin abnormalities on the genitals need to be evaluated. An examination will be needed to know the cause and treatment. Yeast is the most likely possibility and over the counter fungal cream will fix it. Trauma from recent intercourse if possible. Herpes is an std which can cause this. Lichen sclerosis is a common skin disorder that does this. See an Obgyn