Stimulation is the encouragement of development or the cause of activity generally. For example, The press provides stimulation of political discourse. An interesting or fun activity can be described as stimulating, regardless of its physical effects on senses. Stimulate means to act as a stimulus to; stimulus means something that rouses the recipient to activity; stimuli is the plural of stimulus. A particular use of the term is physiological stimulation, which refers to sensory excitation, the action of various agents or forms of energy on receptors that generate impulses that travel through nerves to the brain (afferents).
Scarabs were made in a wide variety of materials, such as carnelian, lapis lazuli, basalt, limestone, malachite, schist, serpentine, turquoise, colored glass, and alabaster. Pottery scarabs were also produced in terra-cotta molds, carved when dry and different colored glazes applied.
A scar is made up of 'connective tissue', gristle-like fibers deposited in the skin by the fibroblasts to hold the wound closed. With keloids, the fibroblasts continue to multiply even after the wound is filled in. Thus keloids project above the surface of the skin and form large mounds of scar tissue. Keloids may form on any part of the body, although the upper chest, shoulders and upper back are especially prone to keloid formation. Symptoms include pigmentation of the skin, itchiness, redness, unusual sensations and pain.