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.
1 Ingrown hairs appear as small bumps on the skin. 2  Ingrown hairs commonly occur on the face, neck, armpits, pubic region, and legs. 3  Ingrown hairs are usually caused by shaving, waxing, or tweezing hair.  Ingrown hairs can cause pain and itching, and they can become infected.