Stain won't disappear. I even used black clothing dye

I used black clothing dye to try remove these marks but it's still on the jumper. I don't know what it is but it's just random brownish blotches that won't disappear even when using clothing dye.

Please help

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crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0