Small blisters are generally referred to as small blisters. A clear rash on the face like small blisters may be caused by eczema, herpes simplex, contact dermatitis and other diseases. 1. Eczema: the cause of eczema is not yet clear, may be genetic, low immunity, hormone level changes and other factors. Patients will have blisters, pimples, edema and other symptoms on the local skin, which are manifested as small blister-like transparent rashes on the face. 2. Herpes simplex: Herpes simplex is mainly caused by herpes simplex virus infection, which can be transmitted through kissing or other close contact. Patients can appear in the face of blisters, usually manifested as a small blisters on the face of the transparent rash, accompanied by local burning, tingling symptoms. 3. Contact dermatitis: contact dermatitis is mainly due to the skin of the face in contact with exogenous substances, resulting in skin irritation or allergic reactions. Patients will appear blisters, pimples, itching, ulcers and other symptoms, manifested as small blisters on the face of the transparent rash. If a patient develops a clear rash like small blisters on the face, he or she should go to the hospital in time to find out the cause of the disease.