Which antibiotic is known to cause a skin rash that presents as red circular dots on the arms?

Penicillin is associated with a skin rash that can manifest as red circular dots, commonly known as a maculopapular rash. This type of rash is particularly notable in patients who are allergic or sensitive to penicillin. The mechanism of this reaction typically involves an immune response to the antibiotic, leading to the appearance of these rashes, which can occur within a few days of starting the medication.

It's important to recognize that while other antibiotics can also cause skin reactions, penicillin is well-documented for producing this specific type of rash. Understanding the potential allergic reactions associated with antibiotics, including penicillin, is crucial for effective clinical practice, especially in managing patients with known allergies or sensitivities. This knowledge helps practitioners avoid prescribing medications that may elicit adverse reactions, ensuring patient safety and comfort.