There are more than 10 common skin diseases seen in adults, such as acne ... often share symptoms like burning and itching. Rashes that appear red in people with lighter skin tones or brown ...

Most HIV rashes aren't serious and will typically clear up in a few days to a few weeks, even without treatment. If the rash is caused by your HIV medicine, you may need to try a new one.

The most common allergy rashes include atopic dermatitis ... American Academy of Dermatology Association. Rash 101 in adults: When to seek medical treatment. MedlinePlus. Hives.

Many adults may not be immune ... ask your doctor for treatments that may ease discomfort like lidocaine gel or magic mouthwash. For skin rashes, if bothersome or widespread, health care providers ...