Skin rashes that do not itch include those caused by excessive heat, fever, chemical irritants and allergic reactions. Some rashes caused by viral or bacterial infections also do not lead to itching, according to the Summit Medical Group.
Some of the most common rashes include dermatitis, viral rashes, eczema, drug reactions and heat rashes, as reported by MedicineNet. Most of these do not causing itching, but they can be bumpy, warm to the touch and cause discomfort. Some of these rashes may also itch at first, but then they stop itching long before the rash disappears.
Dermatitis is often caused by reactions to chemicals or drugs, and it often takes the form of widespread hives. Once the chemical or drug is clear of the system or has been washed off in the case of skin irritants, the hives disappear on their own, according to the Summit Medical Group. Rashes caused by fever and heat don't normally cause discomfort, and they disappear once the body cools and returns to homeostasis.
Rashes caused by viral, bacterial or parasitic infections may or may not itch depending on the microorganism involved, according to the Summit Medical Group. While viral rashes such as chickenpox may itch, others, such as those caused by measles, don't. Rashes caused by viral infection resolve on their own, while rashes caused by bacterial or parasitic infections, such as roundworm, require medical treatment.