Bubble under the skin

[RJOVI]

My sister has three fish that have some kind of contagious disease. Two weeks ago only one fish had it now a total of three have it. She describes it as having bubbles under the skin. One fish has it on the nose and the other two have it towards the rear. All fish are acting normal and eating.
Thanks in advance for any response.

 

[Menagerie]

[center:c8a712c376] First off, Welcome to AA, RJOVI [/center:c8a712c376]

More information will be needed in order to properly help. What type of fish, size of the tank, how long has the tank been set up, water parameters (pH, ammonia levels...) and has anything new been done to the tank, or been added (i.e. new fish, new decorations...)? Also, how often is the water changed?

In the meantime, here are links to Freshwater Diagnostic Charts:
http://www.aquatronicsonline.com/hobbyist/hobbyist3.htm
http://www.clubjungle.com/fish_chart.pdf

 

[Allivymar]

*nods and agrees with Menagerie*

All that info really is necessary to figure out whats going on and how we can help. I know its tough since you're only the messenger and its not your fish but keep in mind the more info we have the more accurate we can be.