what bug bite causes small blisters
Spider bites. 1  Brown recluse spider bites cause a painful bite that later may develop into a bruise or blister. 2  Black widow spider bites typically are not painful but within several hours patients develop a systemic reaction presenting as muscle pain, stomach pain, and breathing difficulties. small blister or pus filled bump usually occurs a few days later. In rare cases, some patients can develop anaphylaxis to fire ant bites. Lice bites usually present as small, red bumps on the shoulders, neck, and scalp. They are very itchy and are a sign that there are probably numerous nits and lice in the scalp.