Used to have those problems all over my body, my doctor gave me = HYDROSONE CREAM to rub. that did the trick. Don't know if you have it in your area. hope you get it. its Good. it works.
possibly colgne or body deodorent?
You may be alergic to your laundry detergent or the soap you're using. even if you've been using the same product that you have been using for a while now, you can all of a sudden develop an alergy. try process of elimination. Do you wear a neckles? if so, you may have developed a nickle alergy. Try and be aware of what happens right before you start to have an episode.
Hope this helps.