.Otherwise skin disease
1.If it starts fading you can wait for few more days for the rashes to disappear.
2. If there is no effect on these rashes it could be due to some other causes other than Syphilis.
Syphilitic rashes will not be itchy, present both sides of the body equally. Different forms of rashes present at the same time(macule, papule, scaly and other types). Mucus membrane would have a different type lesions and there would be enlargement of painless lymph
nodes equally on both halves of body at different sites.If rashes present, the syphilis is well within a year or so.
If it is not matching with this descriptions it would not be due to Syphilitic rashes. Then reactive syphilitic serology has no relation with the rashes. Rashes may be due to other skin disease.