White bump at tip of penis

[B133]

Recently I had an adventure to San Diego and in turn an adventure to Tiajuana.  Before going to Tiajuana (TJ) I took ecstacy for the first time in my life.  While in TJ my friends and I visitied several strip clubs and ultimately a ***** house.  While at the ***** house I didn't realize that the ecstacy would or could prevent me from obtaining an erection, but after a failed attemp of being able to perform I took a viagara. After the Viagara kicked in I proceeded to have protected sexual intercourse with one girl.  

The next day I noticed a white bump near the very tip of my penis.  I thought at first it was syphillus, but than realized that symptoms wouldn't occur for at least ten days.  When I came home my doctor told me that it was irritation and that there was nothing to worry about unless it becomes painful or starts expelling fluid.  

My questions to you are:
a) could there have been anything in the condom that could have caused this?
b) how long should I expect this irritation to be around?
c) is there anything I can do to make it go away faster?
d) should I get a second opinion and get tested properly?

Thanks for your help.