Kissing Gourami Disease Help Please

[bluesfan]

I have 4 kissing gouramis i purchased these about 10 days ago i first put them in quarantine tank then moved to larger tank while in small tank looked okay but since being in other tank have what i can only describe as ulcers under there skin these are black about 1mm in diam + look like blackheads  under there skin could somebody help with treatment please.