Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that the white stuff on the tip of penis along with itching,
redness and tight skin also known as
phimosis seems to be due to
fungal infection known as Mucocutaneous Thrush and there is a possibility that you might have contracted it from your wife..
I would suggest you to consult an Internal Medicine Specialist and get evaluated and he can also advise urethral swab culture and microscopic eximation of white stuff to confirm tha cause..
In case of Thrush you can be advised
Oral antifungal medicines for a period of 3 weeks..
You can be advised to eat plenty of Probiotics like Yoghurt..
You can also be advised to apply antifungal ointment like
Clotrimazole ointment..
Maintain a proper hygiene and abstain from sex or atleast use a condom..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.