Massachusetts Board of Cosmetology Practice Exam

Which of the following is a sign of an allergic reaction to a cosmetic product?

1. Dryness of the skin

2. Redness, swelling, itching, or blistering of the skin

3. Increased hair loss

4. Enhanced shine on the hair

The correct answer is: Redness, swelling, itching, or blistering of the skin

An allergic reaction to a cosmetic product typically manifests through noticeable changes in the skin's condition. Redness, swelling, itching, or blistering are classic symptoms indicating that the body's immune system is responding adversely to the ingredients in the cosmetic. This hypersensitivity could arise from various components, prompting inflammation as a protective response. In contrast, dryness of the skin, increased hair loss, or enhanced shine on the hair might arise from various other conditions or factors unrelated to an allergic response. Dry skin can occur due to environmental factors or product misuse rather than an allergy. Increased hair loss might be linked to hormonal changes, stress, or medical conditions rather than a reaction to a cosmetic product. Enhanced shine on the hair is typically seen as a positive outcome from the use of hair products but does not indicate an allergic reaction at all. Therefore, the signs of redness, swelling, itching, or blistering clearly distinguish an allergic response from these other potential effects.