Red dots on the arms may be related to perifollicular keratosis, polymorphic sun rash, eczema, etc.
1. Keratosis pilaris: it may be related to chromosomal inheritance, vitamin A deficiency, etc., which leads to abnormal keratinization of hair follicle opening enlargement, etc. It is often found on the upper arm. It often occurs on the upper arm, and may appear as red papules of the size of a needle tip to a grain of corn, sometimes accompanied by mild itching.
2. Polymorphic Solar Rash: It is a delayed hypersensitivity reaction induced by sunlight, and localized itching may occur within a few hours after the arm is exposed to sunlight. However, it may take several days for small red papules to appear and itch consciously.
3. Eczema: in the hot environment, local sweating, or contact with allergens such as synthetic fibers, animal hair and so on. There will be red dots on the arm can appear, may also be generalized red dots, accompanied by skin itching.
Red dots on the arm can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, with the help of the doctor to clarify the nature, and targeted treatment or treatment.