Thanks for writing to us.
firstly the description does not match with any STD be it HIV herpes,warts,chancroid
or syphilis etc. STDs usually present with lesions over genitalia, urethral discharge, enlarged inguinal lymph nodes etc .HIv has a constellation of symptoms like loss of weight, diarrhoea,multiple or generalised lymphadenopathy
etc. Other sexually transmitted disease
like hepatitis B
or C will present with jaundice, loss of appetite etc.
So as far as Stds are concerned, both of you appear to be safe. As far as a lump in vein is concerned, you need to consult a physician for the same.
Hope that helped.