Indusium: the case made by an insect larva: a membranous layer of the embryo of Locustidae below the serosa. Explanation of Terms Used in Entomology John. B. Smith. serosa: the outer membrane that envelops the forming embryo, the amnion and the remainder of the egg. Explanation of Terms Used in Entomology John.
In essence, your body forms an allergic reaction to stress. Unfortunately, stress can not be eliminated with histamine, so instead, the histamine just causes hives to appear on your face, neck, chest and other parts of your body.
Some cases of hives can be attributed to the body's sensitivity to clothing or jewelry that fits too tightly against the skin. This can trigger the body's histamine response and result in hives. If any pressure at all causes you to break out in hives, however, you may suffer from a condition known as dermatographia..According to the National Institutes of Health, dermatographia is harmless, but even the slightest touch can cause the skin of dermatographia suffers to break out in hives.hoto Credit pollen image by asb from Fotolia.com. Allergies are a common cause of hives since an allergic reaction can trigger the immune system response that results in trapped fluid beneath the skin. An allergic reaction can occur due to something you ingested or were exposed to through the air.