A burning sensation from a bumpy, red rash may develop due to conditions that include heat rashes, hives, allergic reactions or insect bites. Insect bites can occur in random areas of the neck and chest areas, according to Family Doctor.
Hives and heat rashes can also cause bumps to form on the skin on any area of the body. However, heat rashes tend to develop on the chest and neck areas, states MedicineNet. Hot temperatures can cause heat rash, and it appears as small red pimple-like eruptions.
Allergic reactions to foods, stress and medications can also cause rashes, but there are many more possible causes that include different types of infections and disease, according to Healthline.