Take the Skin Diseases Pictures Quiz and learn to identify common conditions that plague human skin. Skin Problems Slideshow Learn to spot and treat skin conditions commonly found in adults such as acne, eczema, shingles, psoriasis, rosacea, hives, cold sores, razor bumps, athlete's foot, and more. 14 Rashes You Need to Know: Common Dermatologic Diagnoses Lars Grimm, MD, MHS | October 19, | Contributor Information This patient presented with complaints of a solitary, salmon-colored macule that enlarged over several days to become a patch with fine scales and a well-demarcated border. Eczema, also known as atopic dermatitis, is a common adult skin condition. The American Academy of Dermatology estimates 1 to 3-percent of adults have the condition. Most individuals develop the condition during childhood or adolescence and it persists into adulthood. Less often, it develops exclusively in adulthood.