heavy ass weight yes
"un-elastic" skin no
it's amino acids of skin protein being catabolised and metabolised as glucose for brain energy, during acute and chronic periods of 'heavy energy expenditure/need' (workouts, pregnancy, fasting,..)
the skin areas affected are "easy" targets, eg. neck, armpits, elbowpits, glutes, knee pits (folding etc)
for pregnant women or fat people the belly is easy for skin degradation because of the stretch
skin on it's own is very elastic, but combined with (extreme) heavy lifting, genetic weakness (some have more predisposition than others), malnutrition, etc... = marks
so far no cure
gh and other collagen repair improving drugs/methods can be used to minimal degree
lighter skin better visually
some 'heal' or fade better visually
water with pure glucose during workouts as a beginner tip to basic prevention