What are the ways to treat patch due to hair loss?

Hi,

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This is alopecia areata, and the patch on your backside of the scalp is ophiasis, a subtype of alopecia areata. It is thought to be an autoimmune disease in which hair loss is in the form of patches but comes back itself as you have told. Meanwhile, you can apply topical steroids over it like Fluticasone propionate ointment or lotion. Another option is a mixture of topical Canthradine plus topical Capsicum and Methylated spirit in equal proportion and apply for five minutes twice per week as they have an irritant effect. Topical steroids will be beneficial for you. Follow up at one month.