1. Alopecia Universalis
is an Autoimmune disorder, in which the immune system attacks the rapidly growing cells in the hair follicle, resulting in slow hair production, BUT spare the stem cells which form new follicle with new cells, which explains your symptom of come and go.
2. It is inherited as an autosomal recessive trait,any fungal infection
of scalp?worms in abdomen?
3. Take Vitamin B,C,sulphur,iron,zinc, and EFA in diet,with green leafy vegetables, sprouts, salads, milk,fruits,proteins
4. Yogic postures like Vajrasan,Pawanmuktasan are beneficial.
alongwith Immunomodulators (Rasayan chikitsa) is beneficial in the case, talk with your health care provider about the same.