Clear blisters growing on the inner wall of the mouth without pain or itching need to be treated according to the specific cause, such as herpes simplex virus infection, mucous cysts, and after a clear diagnosis, choose to deal with it by general treatment, medication or surgery. 1. Herpes simplex virus infection: oral infection with herpes simplex virus can induce localized herpes, manifesting transparent blisters, which may not be painful or itchy in the early stage. For treatment, antiviral drugs such as acyclovir and ganciclovir can be prescribed. 2. Mucous gland cysts: clear blisters on the inner wall of the mouth that don’t hurt or itch may belong to mucous gland cysts, which can be surgically removed. For recurrent, unclear cysts, can choose to expand the excision. Clear blisters on the inner wall of the mouth do not hurt or itch for different reasons, the treatment is also different, it is recommended that patients with symptoms in a timely manner, under the guidance of the doctor to take targeted treatment, not to private treatment, so as not to lead to adverse consequences.