depends, i'd go see a doctor depending on what the actual problem is.
i thought it could be some cartilage damage, but since it comes and goes, it's not that....
if it is a pimple, which do hurt when you squeeze it if it gets big enough, it'll go away.
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note to readers, clean your ears, inside (not the canal really), out...
inside: get a towel or cotton ball or cotton swab, with soap and water (or rubbing alcohol) dampen it, and wipe. don't soak, because you have to apply some pressure, and you don't want stuff going into the canal.
if you do want to clean your canal, be very careful, use a cotton swab, and dampen it with rubbing alcohol. squeeze it a little to remove excess liquid, and wipe the inside gently. yeah, it gets dirty in there, and don't stick it in, just like swirl around the opening. DON'T STICK IT IN!!!