These sound like striae, colloqially referred to as "stretch marks." These occur in the following contexts: pergnancy,
obesityObesity and health
Overweight, using strong cortisone creams, exercising such as weight lifting. Not much can be done for them, but
RetinRetin a micro gel
Retin a micro gel pump
Retin-a-A cream can help make them fade from red to off-white faster than they would otherwise. I suggest you show a doctor for definitive diagnosis.
Best.
Dr. Rockoff
With luck you've lost the critters by now.
Ta