My right underarm are really sticky and a pus like substance is coming out of it and it smells?

Lymph inflammation: These are called hiradinitis supprativa. Flare-ups may be triggered by perspiration, hormonal changes (such as monthly cycles in women), humidity and heat, and clothing friction. Persistent lesions may lead to scarring and the formation of sinus tracts, or tunnels connecting the abscesses or infections under the skin. At this stage, complete healing is usually not possible, and progression varies.

Sebaceous cyst: It is a sweat gland which is blocked up. Dont squeeze it or use anything yourself to open it. You may use warm compresses to massage it. You may use warm compress massages, or over the counter 'ichthymol' or boil eaze, which black tarry stuff that helps draw out. If still getting biggeer or not going away, go see your doctor.

Hidradenitis: This sounds like hidradenitis suppurativa which is an infection of glands under the arm-pits and sometimes the groin area. You need to be checked by a doctor. Patricio gargollo, md pediatric urology childrens medical center dallas.