Nasty armpit infection?

My husband recently developed a rash on his armpit and it has definitely grown. It's been about 3 weeks since it first showed up. Its in huge blotches on his actual arm pit, and in little red bumps on his side and chest surrounding the arm pit. It has a foul odor. I google-imaged "Armpit infection" and actually found something similar to what he has. It was called Allergic contact dermatitis. I figure if he came in contact with something he instantaneously became allergic to it would be under his other armpit as well or somewhere else on his body. I also figured just because it looks alike doesn't necessarily mean its the same thing. He has not came in contact with any of the main things that cause it, except maybe shampoo/soap but like I said it should be in other areas beside his armpit. Well anyways here is the pictures of it below, has anyone ever seen this before or know what it is? Any over the counter cures? By the way his arm pit isnt discharging or have puss, thats neosporin I put on before taking the picture. Also one more note, I had put alcohol on it before the neosporin, and he said it burned way worse than any other infection he tried to treat with alcohol before. Thanks for your help...

http://i41.tinypic.com/2u55qph.jpg
http://i40.tinypic.com/azdqnq.jpg

[Dr Santos]

Hi,

Another differential that commonly affects the armpit is Hidradenitis suppurativa. It is  skin disease that affects areas bearing apocrine sweat glands and hair follicles. It can present as  clusters of chronic boils that are extremely painful to the touch and may persist for years with occasional to frequent periods of inflammation. (ref: http://en.wikipedia.org/wiki/Hidradenitis_suppurativa)   Flare-ups may be triggered by stress, perspiration, hormonal changes, humid heat, and clothing friction. Persistent lesions may lead to scarring and the formation of sinus tracts, or tunnels connecting the abscesses under the skin.  Occurrences of bacterial infections and cellulitis may also occur at these sites. Treatments may vary depending upon presentation and severity of the disease. Have this evaluated further  for proper management. Direct clinical examination is important for proper diagnosis.

Take care and keep us posted.