The phenomenon of abscess does not always occur in wheals, but it occurs in the middle and late stages of wheals, mainly due to the accumulation of pus from uncontrolled inflammation in the early stages, and the formation of abscess and pus. If it is in the early stage of the wheals, mainly the skin surface redness and swelling as well as tenderness, if this is controlled by anti-inflammatory drugs, such as levofloxacin or oral anti-inflammatory drugs, such as cephalosporin, it is often likely that the inflammation of the wheals will be controlled and may not form an abscess, and the redness and pain will gradually subside. If the initial occurrence is intense or the inflammation is not controlled, it may progress to the middle or late stage of formation of abscess and pus. If an abscess or pus is formed, an incision and drainage may be needed to drain the pus before the wheals can gradually subside.