Arm and thigh pores with small red dots, if it is perifollicular keratosis, can be treated with salicylic acid ointment, vitamin A acid ointment; if it is Malassezia folliculitis, can be treated with clotrimazole ointment, miconazole ointment and other medications; eczema caused by, can be treated with glycerine lotion, hydrocortisone ointment and other medications. 1. Keratosis pilaris: the etiology is unknown, may be related to genetic factors, vitamin A deficiency, metabolic disorders, can cause skin roughness, hair follicles have pimples, the appearance of chicken skin-like changes, and redness of the skin, may lead to the arm and thigh pores, and there are small red spots. You can use topical salicylic acid ointment, retinoic acid ointment, etc. to soften and dissolve the keratin to improve the symptoms. 3. Malassezia folliculitis: the decline in skin defense function or resistance will cause the growth and reproduction of Malassezia, causing inflammation and swelling of the hair follicles, resulting in large pores on the arms and thighs and small red spots. Should keep the skin clean and hygienic, you can use topical clotrimazole ointment, miconazole ointment and other medications. 4. Eczema: internal and external stimulation of a variety of factors caused by inflammatory skin reactions, may also cause arms and thighs pores, and small red spots and itching and other symptoms. You can use glycerine lotion, hydrocortisone ointment and other drugs for treatment. Enlarged pores on the arms and thighs with small red dots, there may be other reasons. You need to go to the hospital in time to check, clarify the cause of the disease and follow the doctor’s instructions for treatment.