A(n) is an area of red, inflamed skin or a group of red spots caused by irritation, allergy, infection or defects to the skin's structure.

Rash.

Explanation:

A rash is an area of red, inflamed skin or a group of red spots caused by irritation, allergy, infection or defects to the skin's structure. Some of the defects caused by rashes to the skin are malfunctioning of the oil gland, pores on the skin become blocked.

Generally, certified medical practitioners such as dermatologists, who are experts or professionals in the study of skin and its diseases usually advise that we take regular care of our body by keeping a good hygiene such as having a regular bath, eat healthy, sun bath and avoid the use of toxic chemicals on our skin.