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.
Acne that forms on the forehead can be due to bumps, clogged pores and rashes from hair bangs. For some people, a Botox injection may cause small lumps and bumps to appear on the head and the hairline. Below are some causes that lead to bumps on forehead.