Armpit rashes can appear in different ways, such as bumpy, smooth, or dry ... and may come and go for many years. Treatments for arm rashes will depend on the underlying cause and severity ...

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 ...