hi, Welcome to health care magic, Causes can be skin infection (bacterial or fungal) lead to replicate themselves and create bad odour,some times genetic or bad hygiene. Most excess sweating could be due to excess sweat glands or their hyper stimulation. Here are some tips to stop this sweating or its odors. 1) If you have eczema or dermatitis or allergy then first take proper antibiotics or anti fungal as per your dermatologist opinion. 2) Always take balanced diet and drink plenty of water daily. 3) Avoid tight fitting clothes rather wear loose clothes. 4) Wear cotton material clothes and avoid synthetic silk. 5) Bath with antibacterial soap like dettol,savlon 6) Always clean groins or armpits,twice or thrice with brush during bathing. 7) Use antiperspirants and deodarants together like aluminium chlorhydrate or zirconium,one will block perspiration and other will mask the smell. 8) Use antibacterial creams or hand sanitizers on groins or armpits. 10) Curtailing excess tea or coffee. Sweating itself doesn t have smell but it provides a favorable medium for bacteria ( present on skin specially on armpits,groin) which releases some aromatic fatty acids causes unpleasant smell. Treatment by two ways. 1) reduce this excess sweating 2) kill the bacteria present over skin ( i)Cumulative execution of earlier tips, ( ii)trying different antiperspirants and apply them only in night bed time and wash in the morning ( don t apply on day time) ( iii)Tab.oxybutynin 10 mg twice daily, ( iv)Topical glycopyrrolate cream or ointment over armpits and other excess sweating areas. ( v) Use of antiseptic/ antibacterial solution like chlorhexidine 0.05% on body and specially on armpits,groin areas. Consult dermatologist for further advice. Thanks