Small red dots and itchy wrists of the elderly may be related to contact dermatitis, eczema, mosquito bites and so on. 1. Contact dermatitis: If the elderly wear a bracelet made of sensitive materials, or come into contact with certain allergens, it may lead to skin allergies, red spots, accompanied by itching symptoms. 2. Eczema: If the wrist area has eczema, the local appearance of small rashes with a flushed base, may also be papules, itching is more intense, when the rash breaks the skin, there will be oozing and crusting. 3. Mosquito bites: If the wrist is bitten by mosquitoes, venom invasion, resulting in skin rash, usually accompanied by itching symptoms. Elderly people have small red spots on the wrist and itchy there may be other reasons, need to consult a doctor in time to find out the cause of the disease, symptomatic treatment.