Fiberglass fibers are extremely thin—thinner than human hair. When they touch your skin, they embed slightly and cause irritation. This reaction is commonly called fiberglass dermatitis. Your body reacts as if it's under attack, leading to redness, burning, and intense itching. It often occurs. Fiberglass exposure, common during renovation or construction work, requires rapid steps to prevent fibers from embedding deeper into the skin and causing prolonged irritation. Multiple ingredients (including sand) are exposed to high temperatures then inserted through small holes to form glass filaments. It helps to protect your skin with gloves and long or disposable protective sleeves, but here is what to do. Fiberglass, often used in construction, renovation, and manufacturing, can cause itchiness and sensitivity in many people.