患者男,28岁,因脱发1个月就诊于我科门诊。患者于1个月前无明显诱因颞部出现边缘不规则小片状脱发,后逐渐发展至整个头部不规则小片状脱发,头皮不痒,无脱屑。患者于半年内曾有多次非婚性接触史,无输血、献血史,否认吸毒史,否认外生殖器溃疡及淋巴结肿大的病史。家族中无类似疾? Male patient, 28 years old, due to hair loss 1 month treatment in our clinic. Patients in a month ago there was no obvious incentive for irregular edge of the temple appeared small piece of hair loss, and gradually developed to the entire head irregular small piece of hair loss, itchy scrotum, no scaling. Patients in the past six months have had many non-marital contact history, no blood transfusion, blood donation history, denied the history of drug abuse, denied genital ulcer and lymph node enlargement history. No similar disease in the family?