My posts as a newbie are being held up so many hours in the que that I doubt this will get up on the board in time to be of help unless something's changed which discourages you from posting at all.
Without seeing the lesion on the OP's penis, you are going to be guessing at what he might have.
Most likely latex or nonoxynol-9 allergy.
The type pain he described with the timing puts at the top of the differential list either , but less likely if he doesn't have a Hx of it latex allergy which most condoms are made of, and never used one with the spermicide,but it could happen any time.
That's why most Hx forms you fill out when seeing an MD have questions about latex allergy-=-not specifically the penis, but in general because it can go the gamut from mild to full anaphylactic shock so for example you don't want to be doing a colonoscopy or any outpt procedure and have a significant latex allergic reaction.
1-3% US allergic to latex. 6-7% who work with latex.
Latex allergy rash on penis or vaginal mucosa.
So can perfumed bubble bath, soap, shower gels even herpes which can sometimes present as an erythmic rash with or without the classic blistered vesicles that are in clusters like a bunch of grapes.
If latex is a problem there are non-latex condoms like Durex Avanti, DZ or Tactylon.
Burning most likely nonoxynol-9 that seemed into the urethra with that timing. It can cause rash commonly as well.
Noxynol-9 less freq. used because it can increase HPV in women.
A large series in NEJM: The use of a nonoxynol 9 vaginal film did not reduce the rate of new HIV, gonorrhea, or chlamydia infection in this group of sex workers who used condoms and received treatment for sexually transmitted diseases.
You asked about DATY: Risks are Herpes, HPV, Gonorrhea, and Syphilils although since the introduction on the market of Penicillin in 1945 syphillis cases are much rarer but they are still seen.
Cunnilingus is considered a low-risk behavior compared with vaginal or anal intercourse, but it's not completely risk-free. Since you are no where near the cervix where these infections live, you're very unlikely to get GC (gonorrhea) or chlamydia. The person performing DATY can get vaginal lining disease conceivably like Herpes, HPV (Human Paipilloma Virus) with Type 16 and others correlating to causing cervical cancer in women, and syphilis which is pretty rare in 2012 but not prior to 1945 when Pen hit the market.
If you are the one with the "Y" and being given head, then you have a relatively small risk that you could get HSV-1 (herpes) from the person giving you head if he/or she had herpes lesions on the lip. Not all blisters on the lip are herpes by any means although I've seen plenty of people who worry they are.
The only way to decrease the relatively low risk from DATY is to use things that are cumbersome, and most people find kills the pleasant sensation from it. Condoms and dental dams. For people allergic to latex, dental dams are made in silicone. Saran wrap can work just as well. The problem with these is that they are not likely to stay on at all in reality, and it's a cold day in July when anyone wants to use them. A dental dam would reduce the chance of getting Herpes or HPV if the person performing DATY had it.
I wouldn't be very afraid of DATY. The enjoyment heavily outweighs the risk unless either partner knows of a significant lesion on one of them. In that case, I would put off oral sex until the lesion is resolved or Tx by a doc.
A very compelling reason for providers to definitely get the HPV vaccine by all means and despite some political noise about mandatory vaccination which I believe in, and Liz Hasselbeck the infectious disease expert on The View's objections to giving it to Grace and the other daughter in a few years (Liz won't and she's the least bright bulb on that panel).
Granted we don't know the long range repercussions side effects of HPV vaccine but the merits and prevention of significant incidences of cervical cancer make a compelling recommendation for the vaccine in girls likely to have sex and a significant percentage start at age 13-15 approximatelyh 7-9% according to CDC.
A couple years ago an NIH survey showed 12,200 women in US were Dx'd withCerfvical CA and 4,000 women in the US died from cervical CA.
Pap smears have defnitely made a significant dent in Cervical CA. We have a much harder time with uterine CA and ovarian CA because those cells extrude down toward the tip of or endocervical lining with only about a 40% frequency. Right now a serum test for ovarian or uterine CA is 50% so we're talking flip of a coin unfortunately and diagnosing those diseases remains a challenge in 2012. Try to make sure your MD always gets endocervical cells on your Pap smear for any ladies reading this with a small brush pushed gently into the cervical opening because the endocervical area near it is where they start. Getting those cells is considered mandatory by all Gyn literature and standards for cervical ca dx. It is of course your doc's job to get those cells and it would be a rare doc that doesn't know to do it but they exist. A gyn will always get them.
While you're waiting to see your derm, if you are still experiencing itching or your rash you can rub a light amount of OTC 1% HTC cream on the area, but a long standing derm caveat is to use low concentration steroid cream on the penis or scrotum because high concentration flourinated steroids have been known to sluff scrotal skin when liberally,sloppily, applied. My smart derm friends warn against ever using it on the scrotal skin, and if you have a lesion there it should be seen by a dermatologist obviously.
If you have prednisone oral on hand, or could get an Rx, there is little harm in trying it using a tapered dose recommended by your MD, similar to a very effective Tx for poison ivy like: 60 mg. X 1 week, 40 mg. X 1 week, 20 mg. X 1 week. Most dermatologists are going to want to see the lesion/rash before Rxing.
Good luck, and I hope I answered some of your questions, and that TER gets this post up before tomorrow. I don't know how long a delay is for newbies.