t. blondi with streachmarks??? please help

[TheWidowsPeak]

ok my goliath is extreamly fat his abdomin is twice the size of his head/or whatever you wanna call it and his bald spot is turning black so the molt is neer. this wouldn't concern me except, at the front of his abdomin he has three fairly large red marks. they look like scratches, but theres nothing in the cage to scratch him. i thought they might be veins but spiders don't have veins do they. they are not uniform marks two run verticly along the abdomin and the other goes horizontilly across the abdomen I have absolutly no idea what this could be please help. oh and i quite feeding him allmost two weeks ago to try to slim him down but no luck hes still huge.

 

[Lopez]

My eating-machine Curly hair gets "stretch marks" from eating so damn much that go black just before he moults.

Personally I always stop feeding them fro a while if the get that fat, but it's a personal thing