Facial rashes that don’t hurt or itch can be caused by conditions such as keratosis pilaris, allergic purpura and acne. 1. Keratosis Pilaris: Keratosis Pilaris is mostly characterized by normal-skinned or reddish pimples, which are mostly found on the face and buttocks, etc. The cause of its formation may be related to metabolic disorders, genetics and endocrine factors. The cause of its formation may be related to metabolic disorders, heredity and endocrine factors. 2. Henochromatosis purpura: It usually manifests as purple-red papules, joint swelling and abdominal pain, etc. Its causes may be related to infection, heredity and drugs. 3. Acne: Its causes are mostly related to inflammation and endocrine factors. It usually manifests as pimples, papules and pustules, and is most common on the head and face. There are many reasons why facial rashes are painless and itchy, so it is recommended that patients seek medical examination to clarify the cause.