The most visible symptom is discolored patches of skin, which typically appear on the arms, chest, neck, or back. These patches could be: pink, red, tan, or brown dry, itchy, and scaly more prominent with tanning prone to disappear in cooler, less humid weather skin discoloration, most commonly seen on the face, neck, chest, and abdomen. patches of discoloration can appear anywhere on your body sweating excessively