Treatments for arm rashes will depend on the underlying cause ... It appears as smooth, clearly defined patches on the skin. It looks red on lighter skin but may look gray, purple, or darker ...

"Having a big red splotch on your arm for a couple of days may not be fun, but the reality is there's no need to panic and no reason not to get your second shot." Brown's rash subsided after a few ...

Medically reviewed by Susan Bard, MD An itchy, blister rash can be caused by an allergic reaction; an autoimmune disorder; a ...

In infants, it shows up as a rash on the face or head. Later, it may spread to the arms and torso. The skin is often dry, itchy, and easily irritated. Symptoms can include: A red rash Scratching ...