When running with my wife, she frequently gets an "itchy" feeling on her legs and stomach area. It has happened in all seasons, but not necessarily on every run. I'm not sure if maybe it is a dehydration issue. Do you have other ideas as to the cause?
Itchy skin (pruritus) when you work out can be quite uncomfortable. There can be many reasons for your wife’s reaction. What you did not mention is how long this has been occurring and if there is a rash. If there is a rash, what does it look like? Does the itchiness spread throughout the torso, buttocks and the thighs? The most important question is, does your wife have difficulty breathing when she runs or when the rash appears? If so, I would recommend having her stop running and see a physician for a thorough workup.
What seems a simple question can cause a cluster of questions. Because the length of the pruritus is unknown, it is difficult to give adequate suggestions. However, there are a few suggestions that may help you out. First, common things that happen are changing soaps or lotions and/or moving to a new area where there are new plants and trees. It also happens that individuals can become sensitive to an old environment. This happens over time due to repeated exposures to something a person was allergic to and did not know because it was below their threshold for a reaction. Then over time, the body builds some type of allergic response to it, and rashes, pruritus and anaphylaxis can occur. The worse of the bunch is anaphylaxis due to throat constriction. This is a medical emergency, and you should go directly to an emergency room.
If none of these things sound familiar, then maybe it is what your wife is wearing or not wearing. Most people have some type of allergic effect to man-made fabrics. Cotton products work well in hot or cold and tend not to cause the same reaction as synthetic products.
Possible solutions are showering before training to decrease the amount of bacteria found on the skin's surface. Most people carry an unbelievable amount of bacteria on the skin’s surface. It is natural and kept in check by our skin flora as well as the skin’s elastic resistance. Dry off well and change clothes after training so the bacteria on the skin’s surface will not flourish. You may also want to talk to a pharmacist and get some suggestions on topical cortisone creams sold over the counter. There are several brands out there that can be very effective for this type of thing.
The skin is the largest organ of the body. It is responsible for many things. If your wife’s rash gets worse or her breathing seems labored, see a doctor. Good luck!