I have dots on my hands, under penis. I searched on diseases about the penis, in that my problem is same seems like the syphilis dots. For syphilis also same types of symptoms are there. But it is an sexual transmitted disease. I am a 19 years student studying 2nd year b.tech.I have not did anything related to sex. But the dots are same like syphilis. I watched so many videos about syphilis as how it will comes to peoples in that I saw a syphilis patient can use pencilin or doxycycline tablets to cure the disease. But I don't know whether it is syphilis or not. A non syphilis patient can use doxycycline tablets?