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.
4. Impetigo. You may develop itchy rash all over body due to a contagious skin disease called impetigo. Caused by streptococcal or staphylococcal bacteria, the disease affects the face and other exposed areas of your body. You will notice superficial blisters all over your body that will be filled with pus.