Detailed answer

Allergies to skincare products are specific immune responses to certain ingredients in the products. These reactions can result in various symptoms like redness, itching, or swelling of the skin. Hair curliness, on the other hand, is determined by the shape of the hair follicle, which is predetermined by genetics. Skincare product allergies do not have any direct impact on the structure or pattern of hair. If you experience changes in hair curliness, it is more likely due to natural hair growth cycles, hormonal changes, heat styling, or other external factors, rather than allergies to skincare products.