What does the term "allergy" refer to in a medical context?

The term "allergy" in a medical context specifically refers to a reaction caused by extreme sensitivity to a normally harmless substance. This sensitivity leads the immune system to overreact to specific allergens, such as certain foods, pollen, pet dander, or other environmental factors. When an allergic individual is exposed to these substances, their immune system mistakenly identifies them as threats, triggering an inflammatory response that can manifest in various symptoms, including sneezing, itching, hives, or even more severe reactions like anaphylaxis.

Understanding this definition is crucial for professionals in the esthetics field, as it emphasizes the importance of being aware of clients' allergies when recommending products or treatments. An essential part of creating a safe and effective treatment environment involves recognizing and avoiding potential allergens that could trigger adverse reactions in clients.