Penicillin V potassium tablets belong to the antibiotic class of drugs, when applied to the human body, it can cause a dense or scattered distribution of peripheral macular rash, maculopapular rash, part of the rash fused into a sheet, and accompanied by itching symptoms. If the itching is more serious, it can cause localized redness, swelling and pain, and some of the rashes are fused into palm-sized or even large patches. If the allergic inflammation is more serious, the color of the rash is bright red, if the inflammation is relatively mild, the color of the rash is light red or dark red, and some of the scratches can cause scratches and scabs on the trunk, limbs and other parts of the body.