Following the etiquette of Ghusl (bath or Shower) I wash below plexus, make Wudu and then have my bath. I also happen to have dry skin condition and my doctor has prescribed application of cream all over the body after every bath or shower, which implies touching the private parts as well now, according to your Fatwa my Wudu, done before the bath becomes nullified. I submitted this question to an Imaam here, who in my opinion is sufficiently learned (a master degree in Islamic theology). His opinion was that the private parts are just parts of ones body and applying the cream after shower would not invalidate the Wudu. Hence no need to make Wudu again. I wonder what would be the right thing to do.

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.

The scholars differed in opinion about the invalidation of ablution by touching one's private parts. The most preponderant opinion here in Islamweb is that it invalidates ablution as this is the opinion of the majority of scholars. It is an opinion that is based on the most correct evidence, and in order to be on the safe side when performing an act of worship, so relying on this opinion is more appropriate. You can use a means to prevent touching directly the private parts or the like, as it is possible for you to renew your ablution. The Fatwa of the said Shaykh is the opinion of some scholars but acting according to the view of the majority of the scholars is more appropriate because of the evidence that we have provided. 

Allaah knows best.