Which of the following statements about erythema is true?

• A. It is redness of the skin
• B. It is a type of swelling
• C. It is hair loss
• D. It is pigmentation change

Answer: (A)

Erythema means redness of the skin caused by increased blood flow to the superficial vessels. In laser hair removal, the treatment heat can cause a brief vasodilation and mild inflammation, which appears as a temporary red flush on the treated area. This normal redness typically fades within hours to a day or two with proper aftercare. The other signs describe different reactions: swelling (edema) is not redness, hair loss refers to loss of hair, and pigmentation change means alterations in skin color due to melanin. So redness of the skin is the true description of erythema.