Detailed answer

Blackheads, also known as open comedones, are caused by the build-up of excess oil and dead skin cells on the skin's surface. They are not directly related to allergies to fabrics. Allergies to fabrics can cause skin irritation, redness, itching, or rash, but not blackheads. Blackheads are typically formed due to clogged hair follicles, not allergic reactions to fabrics. If you are experiencing blackheads, it is recommended to follow a proper skincare routine, including regular exfoliation and keeping the skin clean. If you suspect an allergy to fabrics, consult a healthcare professional for further evaluation and appropriate guidance.