Which type of medication involves application to the skin?

The correct answer is ointments because they are specifically designed for topical application to the skin. Ointments typically have a greasy or oily base that helps to form a protective barrier over the skin, allowing the medication to be absorbed directly at the site of application. This method of delivery is particularly useful for localized treatment of skin conditions, as it provides a direct effect where it is needed.

Suppositories, on the other hand, are intended to be inserted into the rectum or vagina and are absorbed through those tissues. Inhalers deliver medication directly to the lungs through inhalation, making them unsuitable for skin application. Oral tablets are taken by mouth and absorbed through the digestive system, which is a completely different route of administration. Therefore, ointments are the only option that directly involves application to the skin, making it the correct choice.