Polo Ralph Lauren 1/2 zip pullover MENS size medium

Polo brown Cotton 1/2 zip pullover MENS size medium Preowned there are 2 marks on front and one on sleeve - it looks like water - not a true grit grime or yellow stain. I use the gain pellet fabric softener and I’ve noticed it leaves these type water looking marks on fabric. It could be from that. Some color wash wear as this is not brand new Total length is 26 in Underarm to underarm is 21 inches. This is heavy - not the lighter versions