Small stripe spots on ATF

[Ipman37]

Ok so I had this guy for a year I believe and these spots had just started about three months ago he’s eating still and he’s active at night along with the four other tree frogs who don’t have any spots on them,he’s the only one to have it and sometimes when I see him it looks like he’s throwing up I helped him last time and there was this long slimy black thing that came out of his mouth it was alive or anything but it looked really nasty and I don’t know what to do this is the first time this is happening please help me I want my Dean to be ok again