Detailed answer

Hair and scalp keratoacanthomas are typically benign tumors that develop from the hair follicles. While the exact causes of these tumors are not fully understood, there is some evidence to suggest that allergies to skincare products may play a role in their development. Allergic reactions can trigger inflammation and irritation in the skin and hair follicles, potentially leading to the formation of keratoacanthomas. However, it's important to note that allergies alone may not be the primary cause, and other factors, such as genetic predisposition and UV exposure, might also contribute. If you suspect that your skincare products are causing adverse reactions or unusual skin growths, it is advisable to seek medical evaluation and consult with a dermatologist.