I strongly suggest that you STOP using the antiperspirant. Then, don't use ANY antiperspirant after this. Even if this proves to be fungus or an allergy to the oxygen cleaner. There are natural deodorants available these days that you can use when your rash disappears. Tom's of Maine makes some that are affordable and more widely available. I go for the unscented one they make, when I do use a deodorant. But, don't use anything right now.
The reason for avoiding antiperspirants is because your armpits are so close to major lymph nodes in your body, so anything you use in your armpits goes into your blood stream and your lymph nodes.
Do not fear about body odor being an issue. There are still things people can do to remain hygenic. After I made a complete overhaul of my diet, it did take a while to get rid of the returning toxic smell under the arms, so I totally understand the issue people have here. If you don't want to take so many showers it makes your skin on your whole body too dry, which you shouldn't be doing this time of the year anyway, there are still things you can do. You know you need to be gentle on your rash, and you know you need to be careful about which soaps you use. Right now, while this rash is raw, you need to be especially careful. Try "washing" or rinsing under your arms with no soap and only some gentle patting with the washcloth. When the rash is gone, you can use a mild soap.
I have a lot of allergies myself and I found an unscented soap made by a company called Sappo Hill. They use only natural products and they don't use soy, which is highly allergenic for many people. This is a great soap you can try once that rash has disappeared. I use this soap for those times I shave under my arms, too.
Also, DON'T shave under your arms for a while, until this rash disappears. Shaving is an obvious culprit, because it irritates the skin. Then, when you do shave after the rash is gone, shave as infrequently as possible. If you have someone who is intimate in your life, hopefully this person will be understanding and supportive. Because, other than that, who is going to see your underarms this time of the year anyway?
One other thing to try, which is critical for sensitive skin. When you wash your clothes and you're sure that the soap or detergent you're using is not something you're allergic to, once the washer has finished it's cycle, send them through the rinse cycle a second time. In my apartment building, this means that I have to first wash my clothes with the product I'm using, then send the clothes through an entire second cycle with no soaps or detergents, because the machines don't have a rinse only option.
Then, when you go to dry your clothes, wipe out the dryer basin using a spray bottle filled with undiluted white vinegar and a damp cleaning rag. The reason for this is because the vinegar will disolve the residues left by the fabric softeners that people have been using in the dryer. They are petroleum based products, laced with a lot of other chemicals. Do not fear the smell of the vinegar. Vinegar will not linger on your clothes.
In fact, if you still want fabric softening without chemicals, you can add a cup of white vinegar to the rinse cycle when you're washing your clothes. I don't do this, but I read about doing this on a website called care2.com. Go to healthy living and type in vinegar in the search bar.
Now, you can add your clothes to the dryer as usual. I hang up my light delicates, so they don't get static cling or wear out from being in the dryer heat. Everything else goes in the dryer. Also, don't over dry your clothes. That's one thing that creates static cling. Once they're dry, then take them out of the dryer right away and hang up the clothes that go in the closet right away. This will prevent wrinkles, saving you from more work later with an iron.
Hi
Thanks for writing to the forum!
Yes, oxi clean could be the reason of the itch. Also it could be dermatitis or eczema. It can also be fungal infection called tinea corporis. The small swellings on your chest could be lymph nodes due to infection. Examine your breast too for lumps.
It is difficult to comment beyond this without examining. Please discuss this with your doctor (preferably skin specialist) and get yourself investigated accordingly. Please let me know if there is any thing else and do keep me posted. Take care!