They both can cause itchy rashes and appear on the same parts of the body — to an untrained eye they are easy to mix up. Treatments for mild and moderate cases of these conditions are similar ...

Viral, bacterial, parasitic, and fungal infections can cause a rash on the neck. Depending on the type, these infectious microbes can enter your body through a cut or open wound on your skin.

Other causes of an armpit rash include a yeast infection, psoriasis, or seborrheic dermatitis. Rashes are pesky patches of irritated skin that can affect any part of your body, including your armpits.