bjameshill,
Welcome! I am new to the forum as well (I joined in January). How certain are you that you have pois? Could you tell me what your general symptoms are?
The rash you mention on the tip of the penis sound VERY familiar. In Dr. Waldinger's first paper "Postorgasmic Illness Syndrome: Two Cases" he describes two cases of pois. Case 1 experienced "skin erythema; red colored pimples located at the neck, back, and abdomen; generalized itching but particularly in region of penis and anus" (pg. 252 paragraph 1). Case 2 experienced "skin erythema and itching pimples, mainly at the penis" (page 253 paragraph 2).
On a personal note, I experience red rashes and tiny pimples on my hands if they come in contact with semen. The rash resolves within a few days, which means that the Lotrimin could have not been doing anything for you, that the rash was the result of an allergic reaction resolving itself after a couple days of healing naturally. I also have no doubt that the lube is forming a barrier, I have observed this too.
If you have not read Dr. Waldinger's work please do. It has a lot of medical terminology, and I know that focusing is hard but educating yourself is step 1 to getting a diagnosis and getting better. And if you do have pois you can get better, quite a few people are doing the allergy shots and I hope to start very soon myself. If you don't have Waldinger's papers yet give me your email and I'll gladly send it to you, or else ask any of the senior members of the boards.
-Andres