Summer is coming, MM clothes on the body is getting thinner and thinner, to start the show body mode …… but in the bus, subway, office area, in a variety of crowded places, we have more than once to cover the nose knitted eyebrows to shield the people around them issued by the people who “smell and yet “The “fox odor”. What is armpit odor? Axillary odor, is one of the common skin diseases, especially in summer, because of the hot weather and sweating, the odor will seem stronger than in other seasons, where to walk where the unpleasant smell will be smoked, people around often avoid it, seriously affect normal social activities, and even bring psychological barriers to patients. Where does armpit odor come from? Some patients with axillary odor have an obvious family history, and if the parents have this problem, the incidence of children is higher. Therefore, it is possible, but not absolute, that armpit odor is related to genetic factors. Why does it smell so bad? This is mainly because the sweat excreted by the sweat glands (also called parietal glands) in the armpits, vulva and corners of the mouth of patients with axillary odor is higher in fatty acids, light yellow and thicker than that of ordinary people. When the fatty acids reach a certain concentration, the decomposition of bacteria (mainly staphylococcus) on the skin surface produces unsaturated fatty acids and gives off an odor. Patients with armpit odor are deeply distressed due to body odor, and often use external antiperspirant, perfume, flower lotion, etc. to reduce odor, but the effect is often poor. There are many ways to treat axillary odor, but in general, destroying the acromegaly is considered to be the key to the cure of axillary odor. The parietal sweat glands usually develop rapidly during puberty, and secretion gradually reaches its peak, so the best time for patients to be treated is after puberty, otherwise they are prone to recurrence. Axillary odor is a distressing social problem that can seriously affect the quality of life of patients. Invasive surgical treatment can permanently remove the odor. Treatment options include surgical excision of the axillary skin and the subcutaneous sweat glands underneath, small incision subcutaneous sweat trimming, minimally invasive subcutaneous sweat scraping, fat aspiration, and more. However, patients suffer from early postoperative effects on upper limb activity, long recovery time and some methods may leave significant scarring. Intradermal botulinum toxin type A (BTX-A) injection is an effective treatment for axillary hyperhidrosis. Its chemical denervation action blocks the cholinergic nerve endings that innervate the small and large sweat glands, inhibiting sweat secretion. Botulinum toxin type A (BTX-A) has been shown to be effective only in the treatment of certain types of axillary odor. Therefore it is necessary to identify the indications for BTX-A. It was found that BTX-A reduces odor mainly by inhibiting the secretion of small sweat glands (eccrine) and large sweat glands (apoeccrine), but not large sweat glands (apocrine). Patients with a limited relationship between axillary odor and sweating were 10.072 times more likely to develop odor again after BTX-A injection than patients with a strong relationship between odor and sweating. The existence of a close relationship between sweating and axillary odor is an indication for BTX-A treatment of axillary odor. The extent of the axillary hair area was marked before injection (Figure 1). Twenty injection sites were marked in each lateral axilla. After routine sterilization, 2.5 U of BTX-A (Allergan, Inc., Irvine, CA, USA) was injected intradermally into each injection site for a total of 50 U per side. After treatment, we found a significant reduction in sweating followed by elimination of odor. Patients who had a close relationship between sweating and odor before treatment were able to achieve more satisfactory results.