Skin allergies (referred to as contact dermatitis clinically)  are generally a type IV hypersensitivity, also known as T cell-mediated hypersensitivity or delayed-type hypersensitivity. It takes 48-72 hours for the TH1 cells to get to the site of exposure to the allergen. The molecules that cause contact dermatitis are called haptens. Some haptens can be oxidized … Continue reading Type IV Hypersensitivity: Atopic Dermatitis →

Skin allergies, also called contact dermatitis, are generally a type IV hypersensitivity. Contact dermatitis may take up to two weeks to appear depending on what has entered the body. The substances that cause contact dermatitis are called haptens (examples are fragrance, dyes, nickel, and the molecules found in poison ivy).  An example of a skin … Continue reading Allergic Skin Inflammations →