Small red dots on the palms of the hands may be related to contact dermatitis, eczema, mosquito bites and other causes. 1. Contact dermatitis: direct contact of the skin or mucous membranes with some exogenous irritants or allergic substances can lead to an abnormal immune response in the body, which can lead to the phenomenon of small red dots on the palms of the hands. 2. Eczema: Damage to the stratum corneum due to excessive hand washing and contact with detergents can induce eczema, with red papules or mounds of herpes. 3. Mosquito bites: When mosquitoes bite the palms of the hands, their saliva can be released into the body as antigenic substances, leading to abnormal immunity in the body and the appearance of small red spots. It is recommended that people with small red dots on the palms of their hands go to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor, so as not to delay the condition.