If it really is on one branch you could cut the whole branch off. Or the top nugs. Dry somewhere well away from your crop. Cutting the branch off may cause enough stress to make the problem worse though, If you open up the nugs carefully you could cut them off without taking the whole branch and thus less stress.
Depends on how you grow and how longs left. I once had the same problem and thought I got away with it. Problem was I had a staggered grow, perpetual style in the same 2.4x1.2m tent. The crop 3 week behind fully seeded so I had to turn them to hash and kill the ones 3 week behind them entirely.
Theres probably a lot of folk more qualified on the subject than me though!
Good luck
C.W