Unfortunately, our blotchy rash (yes, I have episodes with it as well) can easily be a symptom of numerous other conditions. So, those of you reading, make sure you ask yourselves:
1. Is it localized? - Is the rash just in one part of the body and doesn't seem to change? If so, you may have a skin disease/infection or simple irritation.
2. Have I changed my common surroundings? - Things such as your roommate getting a cat, working in a new building, or simply getting an air purifier (body has to adjust) can all cause a rash as well
3. What is my stress level? - Stress seems to be able to be blamed for almost any symptom nowadays, however, your rash may be due to this and this alone.
3b. Don't fall for those "cleansing" scams - Your body naturally cleanses itself, don't fall for the gimmicks about needing to buy meds to have better bowel movements or cleanse your colon. It's quackery. It isn't the cause of your rash.
4. Is your rash itchy? - This is typically a sign that you have a much more serious condition.
SO FOLKS. You've read through the above and say, "No, my rash isn't like those."
Well, here's a summary of mine for all you out there:
-- Blotchy rash on at least one of the following: face, arms, chest, back, ears
-- Typically appears at the height of a particular emotion such as nervousness or yes, I'll say it, sexual excitement
-- The rash is pink-red, warm to the touch, but typically not itchy or bothersome (at least physically)
-- The rash is NOT raised above the skin, itchy, localized, or constant
Conclusion: From everything I've read, no doctor really can tell what is going on with all of us. There's not really a need to put extensive research into something that isn't physically harmful.
The most likely cause, as I see it, is something I read earlier about your body being sensitive to its own adrenaline. Heightened emotions lead to the secretion of adrenaline (the body releases adrenaline when you are all worked up so you stay alert.) This adrenaline then flows through your entire bloodstream - you may have noticed when you're scared that your hairs on your arms and legs and neck stand up. That is the adrenaline. (It is a defense mechanism designed to make you appear larger to predators.) That means that if adrenaline can make your hair stand up anywhere, that adrenaline is present everywhere in your skin when your body releases it. Finally, this abundance of adrenaline annoys (no need to get into heavy molecular science) your skin and it turns red.
So ask yourself if this makes sense? The longer I am excited/scared/etc., the larger my rash becomes. Why? More adrenaline. More rash. And then the rash goes away once I return to a normal state of mind. Why? Adrenaline numbers also go back to normal.
DISCLAIMER: This is my best guess after having read many forums/posts/documents on rashes and the subject. Every doctor I ever went to isn't really sure. So, folks, we're in on this together.