A round bald spot on scalp can be alopecia areata or fungal infection
to your scalp. Kindly get your examination done and consult a good homoeopathic physician near you to get the best help. Homoeopathy is quite effective in treatment of alopecia. You should apply onion juice on the spot every alternate day, keep it overnight and wash your hair the next day. Coconut milk, almond oil and green tea water application on scalp are also quite effective in alopecia cases.