The diagnostic term actually means tissue death or literally "an eating sore." this condition is usually caused by clostridium perfringens and/or poor blood supply.

The term is gangrene.

Explanation:

Gangrene is a condition which is caused by the death of a body tissue.One of the cause is  a loss of blood supply  d/t an underlying injury/illness or any infection. One of the most common sites are fingers & toes.But it can also occur in the body thereby damaging organs & muscles.The two main types of gangrene are: Dry & Wet Gangrene. Dry is aka mummification.The skin becomes dry, shrivelled and usually dark in color starting from brownish to purple blue & feels cold to be touched.For eg.Atherosclerosis.Dry form of gangrene results from scalds, burns,Raynaud's disease & Vascular problems.Wet Gangrene: Swelling of skin,blisters form & rupture.Pus may appear.It is generally associated with infection of dead tissue.This occurs in people with diabetes, frost bites. Wet forms can develop from injury ( crush injury,Lacerations),embolism & Immune deficiency. Gas Gangrene: also known as Clostridial myonecrosis.It is mainly linked with poorly  cleaned wounds which results from previous surgery where there is a damaged blood supply.Treatment include antibiotics, hyperbaric oxygen therapy,Maggot therapy & surgery.

Well if you pick a machine to work on and that's gonna be your exercise if you don't stick to that machine your muscle strength your muscle mass rather will change because you haven't been doing it you change something in your exercise routine which changes your body's form of dealing with things for example you might become weaker or stronger depending on what kind of exercises you do in whether or not the machine you picked actually your muscles grow.