Common causes of red rashes on the arms include eczema, contact dermatitis, folliculitis, psoriasis and so on.
1. Eczema:The cause of this disease is unknown, it may be related to contact with allergic substances, such as peanuts, soy, milk, pollen, animal hair, etc., or hot and humid environments, or certain diseases, such as autoimmune diseases, thyroid disorders, etc., or neuropsychiatric factors, etc., which is manifested as erythematous spots on the skin, red papules, pimples and other symptoms.
2. Contact dermatitis: this disease is mainly due to skin contact with exogenous pathogenic substances, such as strong acid, alkali, detergents, soap, chemicals, plants, animal fur, etc., stimulating the skin or triggering an allergic reaction. It can lead to erythema, red papules, itching, burning pain and other symptoms on the skin.
3. Folliculitis:This disease is mainly caused by bacteria, fungi and other causes of inflammatory reaction of the hair follicles, manifested as red inflammatory papules and other symptoms.
4. Psoriasis:The cause of this disease is not yet clear, may be related to immune factors, genetic factors, abnormal enzyme activity, infection and other factors. The skin lesions manifest as erythema, red rash, silver-white scales and other symptoms.
It is recommended that patients go to regular hospitals for consultation, clear diagnosis and timely treatment to avoid delay.