White spots on arms

White spots on the arm This phenomenon may be older, in normal times do not pay attention to skin care and sunscreen caused by this phenomenon in most cases is white spot disease, is a symptom of skin aging performance. Normal white spots on the arm caused by this reason, generally will not be unlimited expansion, performance for the needle to mung bean size white spots. In addition, if the white spot is slightly larger in relative area and covered with thin small dander, this situation may also be white pityriasis, which is also clinically called pityriasis simplex, mainly because of local malassezia infection, sun exposure, trace element deficiency, allergies and other reasons.