As per Ayurved, dryness could be because of excessive heat content in the body.
Stop Alopathic medicines and Nutritional supplements if you are taking since long time.
Stop eating excessive spicy food on daily basis. Hv once in a week rather.
Your daily diet should consist of Tender coconut water, Buttermilk, Amla juice, and Coriander water(boiled and cooled).
Ayurvedic medicines such as Chandanasav can be taken 3 tablespoons, twice daily, after meals.
If u are sure of having Worms or
Constipation problem, then take Vidangarishta, 3 tablespoons, twice daily after food .
Continue these medicines and diet regimen for a month. Write for follow up.