Detailed answer

Certain skincare products can contain ingredients that could trigger an allergic reaction when applied to the scalp. These allergic reactions can lead to inflammation and irritation, resulting in hair thinning or even hair loss in some cases. It is important to note that not everyone will experience hair thinning as a result of skincare product allergies, as individual responses vary. If someone suspects that their hair thinning is related to a skincare product allergy, they should consult with a dermatologist to identify the specific allergen and find appropriate alternatives for their skincare routine.