Sepsis is one nasty disorder, as is bacterial septicemia, and fungal septicemia. These are very different and very lethal disorders. Much depends on your immune system: those compromised with HIV, immunosuppressive drugs (following organ transplant) or radiation therapy, will require specific tailoring of treatment.
The causes are any penetration to the skin that has been inflitrated by any of 300 funguses and 7,000 gram-negative and gram-positive bacteria, sexual contact with an infected person, subcutaneous abrasion in the presence of the pathogen, or the pathogen may be inhaled. Other routes include eating contaminated food and drinking stagnant water (giardia is a common pathogen in septicemia as with ordinary amoeba).
Note that fungal septicemia may also be complicated with mixed bacterial septicemia.
As to color of extremities. At onset of fungal septicemia, expect a gray or yellow tinge in the extremities, face, and genitalia. The infection can lay dormant for days or weeks, and then suddenly the immune system is overwhelmed, WBC begins to resemble leukemia, and pustules form.
Discharge may be any color, and gangrene may develop very quickly.
Bacterial septicemia may (or may not) present with red, tender, and very warm hands, feet, and flushed appearance, followed by graying and an "ashen" appearance.
Odor from the infection varies with the pathogen. Fungal septicemia may present with a "spoiled dough" smell and bacteria septicemia may present with a "cadaverine" smell. Either will be quite pronounced, particularly on the breath.
Abdominal swelling then begins usually in the upper left as splenomegaly sets in because the spleen is overloaded with dead and dying RBC's. Pain in the joints can be excruciating owing to extravasion of joint capsules and bursae.
The liver also expands rapidly, trying to deal with a sudden and very nasty buildup of toxins that may vary patient to patient, depending on pathogens. The blood-brain barrier becomes the next target of opportunity, causing dementia, hallucinations, and paralysis.
Fever can vary: one patient will read 102 degrees and another will read 106 -- and acute hyperthermic crisis.
In any case this is not a time to wait. Get to the ER NOW! To treat it we need as much of your medical history as possible, a culture to identify the pathogens, and any compromise of your immune system that allowed the wretched thing to get started.