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.
They are typically quite itchy and have been known to cause a prickly or burning sensation - especially if touched. Stress hives can appear on any part of your body (face, hands, feet, arms, etc.) and can vary in size from as small as the eraser on a pencil to as large as a dinner plate. Stress hives, like a typical hives rash, have been known to spread from place to place, and smaller areas of hives can blend together to create larger areas known as plaques.
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.