The difference between pityriasis rosea and syphilis

Pityriasis rosea is a common self-limiting skin disease, and syphilis is a systemic sexually transmitted disease caused by Treponema pallidum infection. In secondary syphilis, it can show a variety of syphilis, some of which are similar to pityriasis rosea, so it needs to be identified. The characteristics of pityriasis rosea, normal is the first to show a large rash called mother spot, after a week or two to show a lot of small skin lesions called child spot. And syphilis normal no mother spot, syphilis rash normal is painless, no conscious symptoms, and pityriasis rosea is a clear itch. Laboratory examination: pityriasis rosea if check syphilis antibody, must be negative. And syphilis check syphilis antibody is positive, it is easy to distinguish between the two.