These include: 2 , 4 Food allergies Pet dander Airborne allergens, such as pollen Medications, such as antibiotics (especially penicillin and sulfa) or non-steroidal painkillers (aspirin and ibuprofen) Dyes in medications Insect stings or bites Physical stimuli such as pressure, cold, heat, vibrations, exercise, or sun exposure Latex Metals Fragrances and flavorings Detergents and disinfectants Blood transfusions Bacterial infections, including urinary tract infections and strep throat Viral infections, including the common cold, infectious mononucleosis, and hepatitis Some plants, such as poison ivy, oak, and sumac Medical conditions, especially autoimmune conditions such as lupus Despite all the known potential triggers, sometimes urticaria may develop due to unknown causes
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Acetic Acid Acetic acid is an ingredient in hair dye
For the record: 4:55 p.m
The presence of the additional layer provides a better degree of purification