A skin condition that manifests itself in the form of blackheads, whiteheads, pimples and/or cysts. These lesions are thought to result from the accumulation of keratin proteins, bacteria and oil in hair follicles.
A substance that has an opposite reaction to acid and is capable of neutralizing it.
Foreign substances that cause allergic reactions. Examples of allergens are plant pollens, dust mites, animal dander, foods, insect venom, antibiotics, and substances such as latex and rubber.