A serum rash, also known as a serum reaction or serum skin rash, refers to an allergic or irritant skin condition triggered by the use of serums or other topical products. In medical terms, it is called serum dermatitis. The occurrence of a serum rash typically results in redness, itching, and inflammation on the skin's surface. Synonyms for a serum rash include serum allergy, serum-related rash, topical product reaction, or skin irritation due to serums. It is crucial to identify the underlying cause to effectively treat and prevent future occurrences. Seeking medical advice is recommended when experiencing a persistent or severe serum rash.