YES, Acne can be treated permanently. There are various steps of treatment ladder which must be followed, eventually leading to clearance of acne.
We, Dermatologists do not consider vitiligo in line of disease spectrum in itself, but there needs to be proper treatment and counselling for vitiligo as it may cause pyschosocial burdern to the affected person.
In some studies , vitiligo is seen to be associated with insulin resistance.
YES, there is a high possibility of regaining lost hair via combination of topical therapy like Minoxidil (2% for women, 5% for men) and PRP (platelet rich plasma)
Any person wanting for hair transplantation can undergo the procedure after consultation. Early consultation is advisable for availabilty of graft (donor area) . Delay must be avoided.